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{{Infobox ClassicTV|
{{title dab away}}
story name= Terror of the Zygons|
{{real world}}
image= [[Image:Terrorofthezygons_title.jpg|250px]]|
{{ImageLinkTV}}
series=[[Doctor Who]] - [[TV stories|TV Stories]]|
{{Infobox Story SMW
number= [[Season 13]]|
|image                  = Terror of the Zygons.jpg
story number= 80|
|series                 = [[Doctor Who television stories|''Doctor Who'' television stories]]
doctor=[[Fourth Doctor]] |
|season number         = Season 13 (Doctor Who 1963)
companions= [[Sarah Jane Smith]]<br>[[Harry Sullivan]](leaves)<br/>[[Brigadier Lethbridge-Stewart]]<br/>[[Sergeant Benton]] |
|season serial number  = 1
enemy= [[Zygon|The Zygons]]|
|story number           = 80
year= [[Earth]], [[Scotland]], [[Tulloch Moor]], near [[Loch Ness]], [[1970s]]<br>[[England]], Brentford; Westminster |
|doctor                 = Fourth Doctor
writer= [[Robert Banks Stewart]]|
|companions             = [[Sarah Jane Smith|Sarah]], [[Harry Sullivan|Harry]]
director= [[Douglas Camfield]]|
|featuring              = Alistair Gordon Lethbridge-Stewart{{!}}The Brigadier
producer= [[Philip Hinchcliffe]]|
|featuring2            = John Benton
broadcast date= [[30th August]] - [[20th September]] [[1975]]|
|enemy                 = [[Broton]]
format= 4 25-minute episodes|
|setting                = [[Tulloch Moor]] and [[Westminster]], [[20th century]]
production code= [[List of production codes|4F]]|
|writer                 = Robert Banks Stewart
previous story= [[Revenge of the Cybermen]]|
|director               = [[Douglas Camfield]]
next story= [[Planet of Evil]] }}
|producer               = [[Philip Hinchcliffe]]
|novelisation          = Doctor Who and the Loch Ness Monster (novelisation)
|epcount                = 4
|broadcast date         = 30 August - 20 September 1975
|network                = BBC1
|format                 = 4x25-minute episodes
|serial production code = [[List of production codes|4F]]
|prev                  = Revenge of the Cybermen (TV story)
|next                  = Planet of Evil (TV story)
|series2 = [[Fourth Doctor]] television appearances
|prev2 = Disney Time (TV story)
|next2 = Planet of Evil (TV story)
|made prev              = Genesis of the Daleks (TV story)
|made next             = Planet of Evil (TV story)
|clip                  = Cornered by a Zygon - Terror of the Zygons - Doctor Who - BBC
}}
'''''Terror of the Zygons''''' was the first serial of [[Season 13 (Doctor Who 1963)|season 13]] of ''[[Doctor Who]]''. It had been originally produced to conclude [[Season 12 (Doctor Who 1963)|season 12]] and saw the last regular appearance of [[Ian Marter]] as [[Harry Sullivan]] and was the first [[UNIT]] story since ''[[Robot (TV story)|Robot]]''. Although two more UNIT stories followed later this season, this was the last appearance of [[Alistair Gordon Lethbridge-Stewart|the Brigadier]] until 1983's ''[[Mawdryn Undead (TV story)|Mawdryn Undead]]''.


==Synopsis==
Originally a six parter entitled ''The Secret of Loch Ness'', it was condensed down to four by [[script editor]] [[Robert Holmes]]; no significant plot threads were lost in the rewriting. ([[INFO]]: ''Terror of the Zygons'')
The Doctor, Sarah and Harry return to Earth in response to the Brigadier's summons. UNIT are investigating a series of attacks on North Sea oil rigs and have set up a temporary HQ in the Scottish village of Tullock. The attacks are the work of a huge cyborg, the Skarasen, controlled by a group of aliens called Zygons whose spaceship lies at the bottom of Loch Ness.


The Zygons plan to take over the Earth as a substitute for their own planet, which has been devastated by solar flares. They are using their shape-shifting abilities to take on the identities of locals whose inert bodies are held aboard their ship.
The ending of the TV special ''[[Disney Time (TV story)|Disney Time]]'', broadcast just a few days earlier, was designed to tie into the beginning of the serial, as it showed the Doctor receiving the message which sends him to the Brigadier at the beginning of ''Terror of the Zygons''.


The Doctor releases the Zygons' prisoners and causes their ship, which has now emerged from the Loch, to self-destruct. Only their leader, Broton, survives. He has assumed the identity of the Duke of Forgill and travelled to London. There he plans to give a show of strength by destroying a World Energy Conference with the Skarasen, which is now approaching up the Thames.
== Synopsis ==
Having received an urgent request for assistance from the Brigadier, the Doctor, Sarah and Harry arrive in [[Scotland]], where they discover that a mysterious force has destroyed three oil rigs.


Broton is shot by UNIT troops and the Doctor throws the Skarasen its homing device, which it devours. Without a controlling influence, the creature makes its way back to Loch Ness.
The mystery deepens when a piece of wreckage is found with giant teeth marks on it. The trail leads them to the shores of [[Loch Ness]] where they find that the legendary monster really does exist — and is the murderous tool of the [[Zygon]]s, aliens intent on overpowering the planet.


==Plot==
The Doctor, his companions and UNIT must find a way to defeat the deadly [[Loch Ness Monster]] and its controllers, but the Zygons have the terrifying power to change shape. The Doctor's life has never been in more danger, as the line between allies and enemies is tested to the very limit...
[[Image:skarasen.jpg|thumb|300px|The Loch Ness monster is let loose.]]
===Part One===
On an [[oil rig]] off the coast of Scotland, a strange, high pitched beeping sound echoes through the structure, and it begins to break apart, collapsing into the North Sea.


The [[Fourth Doctor]], [[Harry Sullivan|Harry]] and [[Sarah Jane Smith|Sarah]] hitch a ride with a passing motorist to the town where the [[Brigadier Lethbridge-Stewart|Brigadier]] and [[United Nations Intelligence Taskforce|UNIT]] have set themselves up in an inn. The Brigadier is talking to Huckle, an official of Hibernian Oil, who owned the rig. Huckle complains that three such rigs have been destroyed in the last month, two of them belonging to Hibernian. The Brigadier assures Huckle that UNIT is also concerned, especially about the loss of life.
== Plot ==
=== Part one ===
On an [[oil rig]] off the coast of [[Scotland]], a strange, high-pitched beeping sound echoes through the structure. The rig begins to break apart, collapsing into the [[North Sea]]. A radio operator tries to send a mayday, but his efforts are in vain.


The Doctor, Harry and Sarah arrive at the Inn. It turns out that their ride is the Duke of Forgill, a local landowner. The Duke warns Huckle that if his men are caught trespassing on his land, they will be shot. He also wants to know what UNIT are doing here, but the Brigadier says that it is a sensitive matter. Though not pleased, the Duke leaves.  
The [[Fourth Doctor]], [[Harry Sullivan|Harry]] and [[Sarah Jane Smith|Sarah]] hitch a ride with a motorist to the town where [[Alistair Gordon Lethbridge-Stewart|the Brigadier]] and [[UNIT]] have set themselves up in an inn. The Brigadier is talking to Huckle, an official of [[Hibernian Oil]], who owned the rig. Huckle complains that three rigs have been destroyed in the last month, two of them belonging to Hibernian. The Brigadier assures Huckle that UNIT is also concerned, especially about the loss of life.


On the shoreline, a survivor of the destroyed rig washes up, just barely alive. The Brigadier brings the Doctor, Harry and Sarah to Hibernian Oil, where Huckle briefs them on the injuries of the rigs' crew. Harry decides to examine the injuries at the Sickbay, while Sarah goes to talk to some of the locals. Huckle cannot understand it: the rigs were designed to be unsinkable, and the seas were calm and empty prior to the incidents. The Doctor darkly notes that the sea is never empty.
The Doctor, Harry and Sarah arrive at the inn. It turns out that the man who has given them a lift is the [[Duke of Forgill]], a local landowner. The Duke is angry about Huckle's men trespassing on his land. Huckle assures him that he has warned his employees about this, and any who are caught will be dismissed without question. However, the Duke warns that any of Huckle's men caught on his land will be shot. He also wants to know what UNIT are doing here, but the Brigadier says that it is a sensitive matter. Though not pleased, the Duke leaves.


Back at the Inn, Sarah talks to Angus, the landlord. Sarah admires a stuffed stag's head above the fireplace, a gift from the Duke just this past week. Angus observes that the Duke has not been himself since the oil companies came. His servants have left to work for them, leaving Forgill Castle cold and empty. All this while, something alien watches her and Angus on a monitor screen. Angus tells Sarah about Tulloch Moor and how people have disappeared over the centuries when the mist came down. Sarah is sceptical, however &mdash; evil spirits do not destroy oil rigs.  
On the shoreline, a survivor of the destroyed rig washes up, barely alive.


The rig survivor, Munro, is spotted by the Duke's man, the Caber, as Munro staggers from the surf. Harry is driving by and sees Munro too, and goes to him as Munro collapses. Before Munro can tell Harry about what smashed the rig, the Caber fires a rifle, killing Munro and creasing Harry's forehead with a second shot. Harry falls, unconscious. Back at the Inn, the Doctor is working on a radio probe to check for localised jamming when a call comes in informing them about Harry.
The Brigadier brings the Doctor, Harry and Sarah to Hibernian Oil, where Huckle briefs them on the injuries of the rigs' crew. Harry decides to examine the injuries at the [[medical bay|sickbay]], while Sarah goes to talk to some of the locals. Huckle cannot understand it: the rigs were designed to be unsinkable and the seas were calm and empty before the incidents. The Doctor darkly notes that the sea may be calm but is never empty.


Alien hands manipulate strange, organic controls. A high pitched beeping summons a creature from the depths that heads towards the Ben Nevis rig. The rig's communications with Huckle are suddenly jammed by the beeping.
Back at the inn, Sarah talks to [[Angus MacRanald|Angus]], the landlord. She admires a stuffed stag's head above the fireplace, a gift from the Duke just this past week. Angus observes that the Duke has not been himself since the oil companies came. His servants have all left to go and work for them, leaving [[Forgill Castle]] cold and empty. He tells Sarah about [[Tulloch Moor]] and people disappearing over the centuries when the mist comes down. Sarah is sceptical — evil spirits do not destroy oil rigs. All this while, something alien watches Angus and her on a monitor screen.


The Doctor and Sarah visit Harry, who is sedated and being looked after by Sister Lamont, the nurse. The Brigadier arrives, telling him of the [[Ben Nevis]] rig's destruction. Sarah stays with Harry while the Doctor goes with the Brigadier. Outside, the Doctor spots a piece of wreckage from the earlier rig with some odd holes in it. The Doctor asks [[Sergeant Benton]] for some plaster of Paris, and makes a mould of the holes, revealing that something with very large teeth had bitten into the rig. The aliens, watching, decide that the Doctor knows too much and must be destroyed.
The Duke's man, Caber, sees the rig survivor, [[Munro (Terror of the Zygons)|Munro]], stagger from the surf. Harry is driving by and goes to Munro as he collapses. Before Munro can tell Harry about what smashed the rig, Caber fires a rifle, killing Munro and creasing Harry's forehead with a second shot. Harry falls, unconscious. Back at the inn, the Doctor is working on a radio probe to check for localised jamming when a call comes in informing them about Harry.


Harry awakens. Sarah goes to inform the Doctor, while Sister Lamont tells Harry that he will be very well looked after. A high pitched beeping echoes through the room, and Harry looks up in fear. As Sarah calls the Doctor, a suction-tipped hand clamps down on her shoulder. She turns and is grabbed by a large, orange biped creature: a [[Zygon]].
Alien hands manipulate strange, organic controls. A high-pitched beeping summons a creature from the depths. It heads towards the [[Ben Nevis]] rig. The rig's communications with Huckle are jammed.


===Part Two===
The Doctor and Sarah visit Harry, who is sedated and being tended by Sister Lamont, the nurse. The Brigadier arrives to tell him of the Ben Nevis rig's destruction. Sarah stays with Harry while the Doctor goes with the Brigadier. Outside, the Doctor spots wreckage from the rig with odd holes in it. He asks [[John Benton|RSM Benton]] for [[plaster of Paris]] and makes a mould of the holes, revealing that something with very large teeth bit the rig. The watching aliens decide that the Doctor knows too much and must be destroyed.


The Doctor hears Sarah's cries over the telephone and rushes over to the Sickbay. When they get there, Sister Lamont tells them that she found Sarah gone and Harry's bed empty. The Doctor snoops around further, and finds Sarah hiding in a decompression chamber. As Sarah starts telling the Doctor about what happened, a Zygon locks them in and starts to remove the air from the chamber. The Doctor hypnotises Sarah into not needing to breathe, then places himself in a similar trance.  
Harry awakens. Sarah goes to tell the Doctor while Sister Lamont tells Harry he will be very well looked after. A high-pitched beeping echoes through the room, and Harry looks up in fear. As Sarah calls the Doctor, a suction-tipped hand clamps down on her shoulder. She turns as she is grabbed by a large, orange biped creature.


Harry is brought to the Zygon ship deep underwater, where he meets their warlord, Broton. Harry is told that centuries ago, their spaceship was damaged and they landed on [[Earth]]. They were waiting for rescue when they heard that their world had been destroyed in a stellar explosion. Now, they intend to claim Earth for their own, using the sea monster under their command, an armoured cyborg of great power.  Broton explains that the Zygons depend on the lactic fluid of the Skarasen, and Harry realises that if the monster is destroyed, the Zygons will die. Broton declares that no human weapon can affect the Skarasen.
=== Part two ===
The Doctor hears Sarah's cries over the telephone and rushes to the sickbay. Sister Lamont tells them that she found Sarah gone and Harry's bed empty. The Doctor snoops around and finds Sarah unconscious in a decompression chamber. As Sarah comes round and starts telling the Doctor about what happened, a [[Zygon]] locks them in and starts to remove the air from the chamber. To escape death, the Doctor [[Hypnosis|hypnotises]] Sarah into not needing to breathe and then puts himself in a similar trance.


The Brigadier is briefing one of his officers at the Inn when gas floods the room, knocking them all out. Meanwhile, Benton has found the Doctor and Sarah. He manages to open the pressure door, and with air restored, the Doctor exhales and awakens, carefully reviving Sarah. He tells Benton that the trance was a trick he picked up from a Tibetan monk.
[[File:I-Spy.jpg|right|thumb|The [[Zygon]]s spy on the Doctor.]]
Harry is brought to the Zygon ship deep underwater, where he meets their warlord, Broton. Centuries ago, their spaceship was damaged, and they landed on [[Earth]]. They were waiting for rescue when they heard that their world had been destroyed in a stellar explosion. Now, they intend to claim Earth for their own, using the sea monster under their command, an armoured cyborg of great power. Broton explains that the Zygons depend on the lactic fluid of the Skarasen. Harry realises that if the monster is destroyed, the Zygons will die. Broton declares that no human weapon can affect the Skarasen.


The Doctor, Sarah and Benton discover that the entire village has been drugged by some kind of nerve gas, but they soon revive. The Doctor deduces that this was done so that something could get around unseen. The Zygons watch Huckle give the Doctor a device he found in the wreckage: the signal device that summons the Skarasen. Broton says it must be recovered. Harry is taken to another room in the ship, where he sees other humans hooked up to booths, providing the Zygons with "body prints" that they use to assume human form.
The Brigadier is briefing one of his officers at the inn when gas floods the room, knocking them all out. Meanwhile, Sergeant Benton has found the Doctor and Sarah. He opens the pressure door. The Doctor exhales, awakens and carefully revives Sarah. He tells Benton that the trance was a trick he picked up from a [[Tibet]]an [[monk]].


The Doctor hypothesises that the signal device sends out a kind of primeval mating call, attracting the beast to whatever it is attached to. The savaged body of a UNIT soldier is found on the Moor and the Doctor and the Brigadier go to see it, leaving Sarah behind in case Harry turns up. He does, but it is his Zygon duplicate. He takes the signal device, saying that the Doctor asked him to collect it. Sarah notices his curious behaviour and questions him, but he pushes her aside and runs away. Sarah and some soldiers pursue him.
The Doctor, Sarah and Benton find the entire village has been drugged by some kind of nerve gas, but the people soon revive. The Doctor [[deduce]]s that this was done so that something could get around unseen. The Zygons watch Huckle give the Doctor a device he found in the wreckage: the signal device that summons the Skarasen. Broton says that it must be recovered. Harry is taken to another room in the ship, where he sees other humans hooked up to booths, providing the Zygons with "body prints" that they use to assume human form.


Sarah discovers "Harry" hiding in an upper level of a barn, and he attacks her with a pitchfork. She steps aside at the last moment and he falls, injuring himself fatally and turning back into a Zygon. The signal broken, Broton realises his man is dead, and remotely disintegrates the corpse. Harry, however, is freed from his body print booth.
The Doctor hypothesises that the signal device sends out a primeval mating call to attract the beast. The savaged body of a UNIT soldier is found on the moor, and the Doctor and the Brigadier go to see it, leaving Sarah behind in case Harry turns up. He does, but it is his Zygon duplicate Madra. He takes the signal device, saying that the Doctor asked him to collect it. Sarah notices his curious behaviour and questions him, but he pushes her aside and runs away. Sarah and some soldiers pursue him.


Sarah wonders how the aliens knew that they had the signal device. The Brigadier orders the Inn to be searched for bugs. Seeing this, Broton in turn orders that the Skarasen be unleashed, even if it means revealing their presence on this planet. The signal device begins to beep. The Doctor grabs the device to lure the creature away while the Brigadier tries to get a fix on the activating signal.
Sarah discovers "Harry" hiding in the upper level of a barn, and he attacks her with a [[pitchfork]]. She steps aside at the last moment, and he falls, impaling himself on his weapon and turning back into a Zygon. The signal broken, Broton realises that [[Madra]] is dead and remotely [[Zygon dispersal|disperses]] the corpse. Harry, however, is freed from his body print booth.


The Skarasen catches up to the Doctor on the Moor, and he finds that he cannot get rid of the semi-organic signal device which has fastened itself to his palm. The Brigadier manages to trace the incoming signal to [[Loch Ness]]. As the Doctor stumbles, Broton orders the Skarasen to destroy him.
Sarah wonders how the aliens knew they had the signal device. The Brigadier orders the inn searched for bugs. Broton in turn orders the Skarasen unleashed, even if it reveals their presence. The signal device begins to beep. The Doctor grabs it to lure the creature away, while the Brigadier tries to get a fix on the activating signal.


===Part Three===
The Skarasen catches up to the Doctor on the moor, and he finds that he cannot get rid of the semi-organic signal device which has fastened itself to his palm. The Brigadier traces the incoming signal to [[Loch Ness]]. As the Doctor stumbles, Broton orders the Skarasen to destroy him.


Harry rushes into the Zygon control room and randomly hits the controls, causing the device to fall off the Doctor's palm and allowing him to roll out of the Skarasen's way. Since the device is dead, Broton assumes that the Doctor is, too and recalls the Skarasen. The Doctor retrieves the device and makes his way back across the Moor as the Skarasen glides away. In the ship, Harry is dragged away by the other Zygons.  
=== Part three ===
Harry rushes into the Zygon control room and randomly hits controls, making the device fall off the Doctor's palm and allowing him to roll out of the Skarasen's way. Since the device is dead, Broton assumes that the Doctor is too and recalls the Skarasen. The Doctor retrieves the device and makes his way back across the moor as the Skarasen glides away. In the ship, Harry is dragged away by the other Zygons.


The Doctor is met halfway by the Brigadier and Sarah, who tell him that the signal came from Loch Ness. The Doctor decides to go visit Forgill Castle, which is right next to the loch. They get a frosty reception from the Duke, who does not believe them when they tell him about the monster, aliens and their intention to drop depth charges in Loch Ness.  
The Doctor is met halfway by the Brigadier and Sarah, who tell him that the signal came from Loch Ness. The Doctor decides to visit Forgill Castle, right next to the loch. They get a frosty reception from the Duke, who does not believe them about the monster or the aliens and is unhappy with their intention to drop depth charges in Loch Ness.


At the Inn, Angus discovers the Zygon surveillance link in the stuffed deer head that was the Duke's gift. As he tries to pry it loose, Sister Lamont enters the Inn. Before his eyes, the sister turns into a Zygon and kills him, removing the link after. Angus's dying cries are heard by Benton and some UNIT soldiers, who discover the body and go off in pursuit of the killer. The UNIT troops sweep through the nearby forest, and fire on the Zygon.
At the inn, Angus discovers the Zygon surveillance link in the stuffed [[deer]] head that was the Duke's gift. As he tries to pry it loose, Sister Lamont enters the inn. The sister turns into a Zygon and kills him, removing the link after. Angus' dying cries are heard by Benton and some UNIT soldiers, who discover the body and pursue the killer. The UNIT troops sweep through the nearby forest and fire on the Zygon.


The Brigadier is informed that a Zygon is being cornered. He and the Doctor leave Sarah behind at the Castle to research into the monster. In the woods, the wounded Zygon disguises itself once more as Sister Lamont, and fools a UNIT soldier long enough to knock him out and steal his jeep. At the Inn, the Doctor notices the missing eye in the deer head, and realises that the Duke might be a Zygon facsimile.  
The Brigadier is told that a Zygon is being cornered. He and the Doctor leave Sarah at the castle to research the monster. In the woods, the wounded Zygon disguises itself again as Sister Lamont and fools a UNIT soldier long enough to knock him out and steal his [[jeep]]. At the inn, the Doctor notices the missing eye in the deer head and realises that the Duke may be a Zygon facsimile.


At the Castle, as Sarah examines the upper bookshelves, she triggers a hidden switch and a section of the bookcases slides open, revealing a hidden passage. She takes a torchlight and goes in, following a long dark tunnel that leads to the Zygon ship. The "Duke" (in reality Broton) discovers the open bookcase. He and the "Caber" take the wounded "Sister Lamont" down into the ship; the crew must be alerted and the intruder found and destroyed.  
At the castle, Sarah examines the upper bookshelves. She triggers a hidden switch, and a section of the bookcases slides open, revealing a passage. She takes a torchlight and goes in, following a long dark tunnel that leads to the Zygon ship. "The Duke" (in reality Broton) finds the open bookcase. He and "Caber" take the wounded "Sister Lamont" (the Zygon [[Odda]]) into the ship; the crew must be alerted and the intruder found and destroyed.


Exploring, Sarah finds the cell where Harry is being kept. She frees him and they sneak back to the Castle, just in time to meet the Brigadier and the Doctor. Sarah tells the Brigadier about the Zygon ship. The Doctor enters the tunnel, but does not get far a scream is heard. The Zygons emerge in their true forms, Broton telling the humans that they are leaving, with the Doctor as their prisoner. He warns them that the oil rigs were only a test; the "big event" is yet to come. Broton then retreats, sealing the entrance to the tunnel.
Sarah finds the cell where Harry is held. She frees him, and they sneak back to the castle, just in time to meet the Brigadier and the Doctor. Sarah tells the Brigadier about the Zygon ship. The Doctor enters the tunnel but does not get far; a scream is heard. The Zygons emerge in their true forms. Broton tells the humans that they are leaving with the Doctor as their prisoner. He warns them that the oil rigs were only a test; the "big event" is yet to come. Broton retreats, sealing the entrance to the tunnel.


The Brigadier orders the loch to be depth charged, to try and bring the Zygon ship to the surface. The Zygon ship does rise, but keeps on rising into the sky, flying away.
The Brigadier orders the loch depth-charged to bring the Zygon ship to the surface. The Zygon ship does rise but keeps on rising into the sky, flying away.


===Part Four===
=== Part four ===
Broton orders a jamming signal transmitted to block the humans' radar systems. The Brigadier prepares to move his troops out, but Sarah and Harry suggest they search Forgill Castle before they leave for clues to the Zygons' plans. Sarah finds some papers that indicate the Duke is the President of the [[Scottish Energy Commission]], but Harry dismisses the information as useless. They return with the Brigadier to [[London]].


Broton orders a jamming signal to be transmitted to block the humans' radar tracking systems. The Brigadier prepares to move his troops out, but Sarah and Harry suggest they search Forgill Castle before they leave to see if they can find a clue to the Zygons' plans. There, Sarah finds some papers that indicate the Duke is the President of the Scottish Energy Commission, but Harry dismisses the information as useless. They return with the Brigadier to [[London]].
The Zygon ship lands in a disused [[quarry]]. UNIT cannot track it. Radar stations are knocked out all over the country. However, there are reports of a large underwater object heading south at high speed. Broton enters the Doctor's cell and, taking the Duke's form again, tells him that Phase I of the conquest of Earth is complete. A great Zygon refugee ship is on its way but will take some centuries to arrive. In the meantime, Earth's environment must be restructured with human labour and Zygon technology to turn it into a new homeworld.


The Zygon ship lands in a disused quarry, with UNIT unable to track it as radar stations are knocked out all over the country. However, there are reports of a large underwater object heading South at high speed. Broton enters the Doctor's cell and, taking the Duke's form again, tells him that Phase I of the conquest of Earth is complete. A great Zygon refugee ship is on its way, but will take some centuries to arrive. In the meantime, Earth's environment must be restructured, using human labour and Zygon technology to turn it into a new homeworld.  
Left alone, the Doctor rigs some of the organic technology in his cell, electrocuting himself but sending a transmission to help UNIT track the ship to the quarry. By the time Broton and his men open the Doctor's cell door, the Doctor is apparently dead. However, when Broton leaves, the Doctor comes to. He makes his way to the body print chamber and frees the real Duke, Sister Lamont and Caber.


Left alone, the Doctor rigs some of the organic technology in his cell, electrocuting himself but sending a transmission to aid UNIT in tracking the ship to the quarry. By the time Broton and his men manage to open the Doctor's cell door, the Doctor is apparently dead. However, when Broton leaves, the Doctor comes to. He makes his way to the body print chamber and frees the real Duke, Sister Lamont and the Caber.  
Broton leaves the ship to plant a trilanic activator on his target, which the Skarasen will then destroy, proving the power the Zygons hold. When Phase II is complete, he will broadcast his demands to the world. Inside the ship, the Doctor uses [[The Doctor's sonic screwdriver|his sonic screwdriver]] to set off the fire sensor, triggering an alarm. When the Zygons go to investigate, the Doctor ushers the humans out of the ship, jamming the hatches and activating the ship's self-destruct.


Broton leaves the ship to plant a signal device on his intended target, which the Skarasen will then destroy, proving the power the Zygons hold. When Phase II is complete, he will broadcast his demands to the world. Inside the ship, the Doctor uses his [[sonic screwdriver]] to set off the fire sensor, triggering an alarm. When the Zygons go to investigate, the Doctor ushers the humans out of the ship, jamming the hatches on the way out and activating the ship's self destruct.
[[File:Cast ensemble.jpg|right|thumb|The Doctor, Sarah Jane, Harry, the Brigadier and the Duke of Forgill look upon the TARDIS.]]
The Brigadier has arrived, and the escapees reach UNIT's position. The Doctor shouts for everyone to get down, just before the Zygon ship explodes. However, Broton is still free and has control of the Skarasen. The target is in [[London]] and must be close to the [[River Thames]].


The Brigadier has arrived, and the escapees reach UNIT's position, the Doctor shouting for everyone to get down just before the Zygon ship explodes. However, Broton is still out there and has control of the Skarasen. The target is in London, and has to be close to the [[River Thames]]. The Brigadier says that [[Prime Minister of the United Kingdom|Prime Minister]] will be attending a conference at Stanbridge House, near the river. The Duke adds that it is the 1st International Energy Conference, with delegates from all over the world in attendance. As the Duke is the President of the Scottish Energy Commission, Broton will have a pass into the meeting. They leave for London.
The Brigadier says the [[Prime Minister]] will be at a conference at [[Stanbridge House]], near the river. The Duke adds it is the first [[International Energy Conference]], with delegates from all over the world. As the Duke is the President of the Scottish Energy Commission, Broton will have a pass into the meeting. They leave for London.


The "Duke" places the signal device in the basement of Stanbridge House, while the Skarasen has been sighted mere minutes away. The Doctor finds Broton, back in his true form, who swears he will make sure the Doctor is dead this time and attacks him. Sarah calls for the Brigadier, who arrives to shoot Broton dead. The Doctor finds the signal device in his pocket, and feeds it to the Skarasen as it rises out of the Thames. After it consumes the device, the beast sinks back into the river and heads back to Loch Ness, the only home it has ever known.
"The Duke" places the activator in the [[basement]] of Stanbridge House. The Skarasen has been sighted mere minutes away. The Doctor finds Broton, back in his true form, who swears he will make sure the Doctor is dead this time and attacks him. Sarah calls for the Brigadier, who arrives to shoot Broton dead. The Doctor finds the [[trilanic activator]] in his pocket and feeds it to the Skarasen as it rises out of the Thames. After it consumes the device, the beast sinks back into the river and heads back to Loch Ness, the only home it has ever known. However, it is witnessed by not only the Doctor, Sarah and Harry, but many terrified Londoners.


Returning to Scotland, the Brigadier tells the Duke that the incident will be kept quiet, even the appearance of a fifty foot monster in the Thames. The Doctor leads them into the woods where the [[the Doctor's TARDIS|TARDIS]] is, and offers all of them a lift, but the Brigadier and Harry decline. Sarah agrees on the condition they do go straight back to London. The Doctor promises, and the TARDIS takes off. The Duke tells the Brigadier that, as a Scotsman, he should have gotten a refund for Sarah and the Doctor's return train tickets.
Returning to Scotland, the Brigadier tells the Duke that the incident will be kept quiet, even the appearance of a fifty foot monster in the Thames. The Doctor leads them into the woods to [[the Doctor's TARDIS|the TARDIS]] and offers all of them a lift. The Brigadier and Harry decline. Sarah agrees on the condition they go straight back to London. The Doctor promises, and the TARDIS takes off with the Doctor and Sarah inside. The Duke tells the Brigadier that, as a Scotsman, he should have gotten a refund for Sarah and the Doctor's return train tickets.


==Cast==
== Cast ==
*[[Fourth Doctor | The Doctor]] - [[Tom Baker]]
* [[Fourth Doctor|Doctor Who]] - [[Tom Baker]]
*[[Sarah Jane Smith]] - [[Elisabeth Sladen]]
* [[Sarah Jane Smith]] - [[Elisabeth Sladen]]
*[[Harry Sullivan]] - [[Ian Marter]]
* [[Harry Sullivan]] - [[Ian Marter]]
*[[Brigadier Lethbridge-Stewart]] - [[Nicholas Courtney]]
* [[Alistair Gordon Lethbridge-Stewart|Brigadier Lethbridge-Stewart]] - [[Nicholas Courtney]]
*RSM [[Benton]] - [[John Levene]]
* [[John Benton|RSM Benton]] - [[John Levene]]
*[[Duke of Forgill]]/[[Broton]] - [[John Woodnutt]]
* [[Duke of Forgill]]/[[Broton]] - [[John Woodnutt]]
*Sister [[Lamont]] - [[Lillias Walker]]
* [[Lamont|Sister Lamont]] - [[Lillias Walker]]
*The Caber - [[Robert Russell]]
* [[Caber|The Caber]] - [[Robert Russell]]
*[[Angus]] - [[Angus Lennie]]
* [[Angus MacRanald|Angus]] - [[Angus Lennie]]
*[[Huckle]] - [[Tony Sibbald]]
* [[Huckle]] - [[Tony Sibbald]]
*[[Munro]] - [[Hugh Martin]]
* [[Jock Munro|Munro]] - [[Hugh Martin]]
*Radio Operator - [[Bruce Wightman]]
* [[Radio operator (Terror of the Zygons)|Radio Operator]] - [[Bruce Wightman]]
*Corporal - [[Bernard G. High]]
* [[Palmer (Terror of the Zygons)|Corporal]] - [[Bernard G. High]]
*Soldier - [[Peter Symonds]]
* [[Soldier 1 (Terror of the Zygons)|Soldier]] - [[Peter Symonds]]
*[[Zygon]] - [[Keith Ashley]]
* [[Zygon]] - [[Keith Ashley]]
*[[Zygon]] - [[Ronald Gough]]
* [[Zygon]] - [[Ronald Gough]]


==Crew==
=== Uncredited cast ===
*[[Assistant Floor Manager]] - [[Rosemary Webb]]
* [[Thurston]] - [[Barry Summerford]] ([[DWM 210]])
*[[Costumes]] - [[James Acheson]]
* UNIT Soldiers - [[James Muir]], [[Patrick Ginter]], [[Rowland Geall]] (DWM 210)
*[[Designer]] - [[Nigel Curzon]]
* [[Morton (Terror of the Zygons)|Morton]] - [[Alan Clements]] (DWM 210, [[INFO]]: ''Terror of the Zygons'')
*[[Film Cameraman]] - [[Peter Hall]]
*[[Film Editor]] - [[Ian McKendrick]]
*[[Incidental Music]] - [[Geoffrey Burgon]]
*[[Make-Up]] - [[Sylvia James]]
*[[Producer]] - [[Philip Hinchcliffe]]
*[[Production Assistant]] - [[Edwina Craze]]
*[[Production Unit Manager]] - [[George Gallaccio]]
*[[Script Editor]] - [[Robert Holmes]]
*[[Special Sounds]] - [[Dick Mills]]
*[[Studio Lighting]] - [[John Dixon]]
*[[Studio Sound]] - [[Michael McCarthy]]
*[[Theme Arrangement]] - [[Delia Derbyshire]]
*[[Title Music]] - [[Ron Grainer]]
*[[Visual Effects]] - [[John Horton]], [[John Friedlander]]


==References==
== Crew ==
*Broton intended to disrupt the [[World Energy Conference]].
* [[Assistant Floor Manager]] - [[Rosemary Webb]]
* [[Costumes]] - [[James Acheson]]
* [[Designer (crew)|Designer]] - [[Nigel Curzon]]
* [[Film Cameraman]] - [[Peter Hall]]
* [[Film Editor]] - [[Ian McKendrick]]
* [[Film sound|Film Sound]] - [[John Tellick]]
* [[Incidental Music]] - [[Geoffrey Burgon]]
* [[Make-Up]] - [[Sylvia James]]
* [[Producer]] - [[Philip Hinchcliffe]]
* [[Production Assistant]] - [[Edwina Craze]]
* [[Production Unit Manager]] - [[George Gallaccio]]
* [[Script Editor]] - [[Robert Holmes]]
* [[Special Sounds]] - [[Dick Mills]]
* [[Studio Lighting]] - [[John Dixon (technician)|John Dixon]]
* [[Studio Sound]] - [[Michael McCarthy]]
* [[Theme Arrangement]] - [[Delia Derbyshire]]
* [[Doctor Who theme|Title Music]] - [[Ron Grainer]]
* [[Visual Effects Designer]] - [[John Horton]]


*The [[Skarasen]] is a [[cyborg]].
=== Uncredited crew ===
*The Doctor is summoned back to [[Earth]] via the [[space time telegraph]] (it functions via a [[psionic beam]]) he left with [[the Brigadier]].
* [[Assistant floor manager|Assistant Floor Manager]] - [[Rosemary Webb]] ([[INFO]]: ''Terror of the Zygons'')
* [[Grams operator|Grams Operator]] - [[Gordon Phillipson]] ([[INFO]]: ''Terror of the Zygons'')
* [[Make-up assistant|Make-Up Assistants]] - [[Suzanne Jansen]], [[Martha Livesey]] ([[INFO]]: ''Terror of the Zygons'')
* [[Visual effects assistant|Visual Effects Assistantsa]] - [[Roger Barham]], [[Len Hutton]], [[Charlie Lumm]], [[Colin Mapson]], [[Steve Bowman]], [[Steven Drewett|Steve Drewett]], [[Richard Conway]] ([[INFO]]: ''Terror of the Zygons'')
* [[Film cameraman|Film Camera Assistant]] - [[Alec Curtis]] ([[INFO]]: ''Terror of the Zygons'')
* [[Film sound|Film Sound Assistant]] - [[Clive Derbyshire]] ([[INFO]]: ''Terror of the Zygons'')
* [[Grip]]s - [[Roy Monks]], [[Dennis Rogers]] ([[INFO]]: ''Terror of the Zygons'')
* [[Props buyer|Props Buyer]] - [[Eric Barker]], [[Robert Sutton]] ([[INFO]]: ''Terror of the Zygons'')
* [[Technical manager|Technical Manager]] - [[Henry Barber]] ([[INFO]]: ''Terror of the Zygons'')
* [[Director's assistant|Director's Assistant]] - [[Joy Sinclair]] ([[INFO]]: ''Terror of the Zygons'')
* [[Floor assistant|Floor Assistant]] - [[Carol Scott]] ([[INFO]]: ''Terror of the Zygons'')
* [[Costume dresser|Dressers]] - [[Elizabeth Lincott]], [[Michael Purcell]], [[Jack Rowe]] ([[INFO]]: ''Terror of the Zygons'')
* [[Inlay operator|Inlay Operator]] - [[Dave Jervis]] ([[INFO]]: ''Terror of the Zygons'')
* [[Vision mixer|Vision Mixer]] - [[Nick Lake]] ([[INFO]]: ''Terror of the Zygons'')
* [[Film operative|Film Operatives]] - [[Leslie Baker]], [[Spike Hughes]], [[Dick Norwood]], [[Brian West]] ([[INFO]]: ''Terror of the Zygons'')
* [[Film operatives manager|Film Ops Manager]] - [[Ian Brindle]] ([[INFO]]: ''Terror of the Zygons'')
* [[Facilities assistant|Facilities Assistants]] - [[Jennie Betts]], [[Carol Vigurs]] ([[INFO]]: ''Terror of the Zygons'')
* [[Senior cameraman|Senior Cameraman]] - [[Paul Kay]] ([[INFO]]: ''Terror of the Zygons'')


*The Zygon ship operates on a [[dynacron thrust]] via [[organic crystalography]].
== Worldbuilding ==
*The Doctor [[hypnosis|mesmerises]] Sarah to prevent her from suffocating when they are locked in the decompression chamber a trick he said "''I picked up from a [[Tibet|Tibetan]] monk"''.
=== The Doctor's items ===
*The Doctor drives a [[UNIT]] [[Land Rover]] out to the moor.
* The [[space-time telegraph]] functions via a [[psionic beam]].


==Story Notes==
=== Music ===
*This story had working titles of; '''Loch Ness''', '''The Secret Of The Loch''', '''Secret Of Loch Ness''', '''The Loch Ness Monster''', '''The Zygons'''.
* Angus plays "[[Flowers of the Forest]]" on the [[bagpipes]]. The Doctor refers to it as a "lament for the dead".
*This story was originally planned to end [[Season 12]], but was pushed back to the start of [[Season 13]] in order to allow the series to shift its broadcast schedule from a January start (as had been the case since 1970) to September.[http://www.shannonsullivan.com/drwho/serials/4f.html]


===Ratings===
=== Organisations ===
*Part 1 - 8.4 million viewers
* Broton intended to disrupt the [[World Energy Conference]].
*Part 2 - 6.1 million viewers
*Part 3 - 8.2 million viewers
*Part 4 - 7.2 million viewers


===Myths===
=== Technology ===
''to be added''
* The Zygon ship operates on a [[dynacron thrust]] via [[organic crystalography]].


===Location Filming===
=== Vehicles ===
*Climping Beach, Littlehampton, West Sussex
* The Doctor drives a [[UNIT]] [[Land Rover]] out to the moor.
*Hall Aggregates Quarry, Storrington, West Sussex
*Furnace Pond, Mill Lane, Crabtree, West Sussex
*Millbank, London
*Ambersham Common, South Ambersham, West Sussex
*Charlton, West Sussex
*Westminster Bridge, Westminster, London
*[[BBC Television Centre]] (TC3 & TC4), Shepherd's Bush, [[London]]


===Discontinuity, Plot Holes, Errors===
=== Influences ===
* The Brigadier is heard speaking to a female Prime Minister, though cannot take place in the future Thatcher years as the Brigadier had retired by then. ([[DW]]: ''[[Mawdryn Undead]]'') The BBC's website states this Prime Minister to actually be Shirley Williams [http://www.bbc.co.uk/doctorwho/classic/episodeguide/partypolitics.shtml], but she was never Labour Party leader (though as she was a notable Cabinet Minister, the production crew may have assumed she would be in the near future). ''In the Doctor Who universe, she may indeed have taken the role.''
*Would destroying an energy conference, even if all of the worlds major leaders were present, really cause the kind of havoc the Zygons need to pave the way for an invasion? ''This was only to be the first of several such attacks.''
*Broton's explanation at the end of episode three that the destruction of the various oil rigs was only a 'trial of strength' for the Skarasen seems a little unconvincing. Surely they could have come up with a less elaborate plan to test the readiness of their monster. ''Broton's explanation was only a ruse so-as not to give away their real plans to UNIT. It was the destruction of the oil rigs which triggered the emergency energy conference which the Zygons were planning to attack all along.''
*What was the Zygon's plans prior to hearing about the destruction of their homeworld? They seem to have been hanging around under Loch Ness for centuries. ''They did not have enough fuel to return home so they just intended to stay hidden for the rest of their lives. However, once they'd heard that their people had become refugees, they knew they had sieze control of the Earth and sprung into action.''


==Continuity==
* [[Robert Banks Stewart]] was largely unfamiliar with the series, so he wrote the Doctor, Sarah and Harry in the style of the main characters in [[The Avengers (TV series)|''The Avengers'']], which he had previously written for.
*[[DW]]: ''[[Timelash (TV story) | Timelash]]'' offers another explanation of the Loch Ness Monster.
*[[DW]]: ''[[Remembrance of the Daleks]]'' the Doctor mentions "The Zygon Gambit"
* In [[DW]]: ''[[School Reunion]]' during Sarah's comparison of travels with Rose she mentions the Loch Ness Monster.
*[[EDA]]: ''[[The Bodysnatchers]]'' features the Zygons and Skarasen.
*[[NSA]]: ''[[Sting of the Zygons]]'' also features Zygons and Skarasens.
*This is Harry Sullivan's last regular on-screen appearance, he however appears in [[DW]]: ''[[The Android Invasion]]'' and reappears (in his own timeline after this story) in [[MA]]: ''[[System Shock]]'' and [[PDA]]: ''[[Millennium Shock]]''.


==DVD, Video and Laserdisc Releases==
== Story notes ==
''to be added''
* This story had working titles of: ''Loch Ness'', ''The Secret of the Loch'', ''Secret of Loch Ness'', ''The Loch Ness Monster'' and ''The Zygons''.
* This story was originally planned to end [[Season 12 (Doctor Who 1963)|season 12]], but was pushed back to the start of [[Season 13 (Doctor Who 1963)|season 13]] to allow the series to shift its broadcast schedule from a January start (its routine since 1970) to September.[http://www.shannonsullivan.com/drwho/serials/4f.html]
* [[Nicholas Courtney]] is credited as "Brigadier" in ''Radio Times'' for part four.
* ''[[Radio Times]]'' credits [[John Woodnutt]] as "Duke of Forgill" for part one, "Broton" for parts two and three, and "Broton/Duke of Forgill" for part four. All on-screen credits read "Duke of Forgill".
* [[Radio Times|The ''Radio Times'']] programme listing for part one was accompanied by a black-and-white illustration by [[Frank Bellamy]] depicting the Doctor in his tam-o'-shanter, the oil rig being destroyed and the Skarasen's eye, with the accompanying caption "A tartan touch for ''Dr. Who'' when he faces a new breed of monsters that bring terror to the North Sea: 5.45".
* ''[[Radio Times]]'' art editor David Driver commissioned a full colour illustration from Frank Bellamy — depicting the Zygon spaceship taking off, the Doctor and the Skarasen, with a comic strip style speech balloon for the Doctor reading "WE'RE DEALING WITH A CREATURE THAT IS NOT OF ORDINARY FLESH AND BLOOD..." — in the hope it would be used as a front cover for the forthcoming 30 August–5 September 1975 issue to tie-in with the start of season 13. This never happened, but the artwork eventually saw print as part of ''Still waters'', a two-page ''Radio Times'' article by Andrew Haden-Guest about the Loch Ness monster which featured in that issue. The introduction for the article read "Dr. Who / Saturday BBC1 / What is Nessie? Who can tell? In a new series starting this week, Dr. Who takes on the unidentified incumbent of Loch Ness. Here Anthony Haden-Guest plumbs the depths of the Scottish mystery". ''(original published text)''
* This is the only season opener to feature a companion departure, though Harry would return later in season 13 for ''[[The Android Invasion (TV story)|The Android Invasion]]''.
* The departure of Harry while Sarah remains with the Doctor marks one of only two incontrovertible times in the televised classic series that a companion, who had already been with the Doctor before another one joins, remains with him after the second companion leaves. [[Jamie McCrimmon|Jamie]] arrived before [[Victoria Waterfield]] and remained after her departure. Two other arguable examples would be [[Katarina]] and [[Sara Kingdom]], who weren't with the Doctor very long, and ended up dying. Generally, the Doctor's roster of companions revolves fairly consistently.
* This was the only on-screen appearance of the Zygons, save for flashbacks and verbal references, during the classic series. A Zygon was apparently to have appeared, along with a [[Dalek]] and a [[Cyberman]], among the alien prisoners on the [[Shada (prison)|Time Lords' prison planet]] in Douglas Adams's original script of ''[[Shada (TV story)|Shada]]'', but the scenes set inside Shada itself were never recorded. The Zygons made their first on-screen appearance in the revived series in the ''Doctor Who'' 50th Anniversary episode, ''[[The Day of the Doctor (TV story)|The Day of the Doctor]], ''an episode which also featured the return of [[Tom Baker]] in a special cameo.
* On the DVD release of this story, it featured a deleted scene set at the start of the story featuring the TARDIS materialising invisibly due to a faulty fusion plate. It was in a mixture of colour and black-and-white, but the monochrome sections were recoloured manually by the YouTuber Stuart Humphryes, a.k.a. Babelcolour, who also worked on ''[[The Mind of Evil (TV story)|The Mind of Evil]]'' and ''[[Genesis of the Daleks (TV story)|Genesis of the Daleks]]'' DVDs. The original unrestored colour and black-and-white version is included on the DVD as an Easter egg.
* [[Margaret Thatcher]] had been elected Leader of the Conservative Party in February 1975, a few weeks before the story began production. Knowing that the UNIT stories were intended to be set a few years in the future, [[Nicholas Courtney]] ad-libbed the reference to the Prime Minister as “Madam” to suggest Thatcher was in office by the time the story was set.
* This is, effectively, the earliest ''Doctor Who'' story directed wholly by [[Douglas Camfield]] to survive in its entirety. On ''[[Planet of Giants (TV story)|Planet of Giants]]'', Camfield only directed the final episode whilst on ''[[Inferno (TV story)|Inferno]]'' he did not direct most of the studio scenes due to falling ill with a heart condition. ''[[The Crusade (TV story)|The Crusade]]'', ''[[The Daleks' Master Plan (TV story)|The Daleks' Master Plan]]'', ''[[The Web of Fear (TV story)|The Web of Fear]]'' and ''[[The Invasion (TV story)|The Invasion]]'' are all missing [[missing episode|episodes]]; and ''[[The Time Meddler (TV story)|The Time Meddler]]'' is missing approximately twelve seconds of footage from its last episode, "Checkmate".
* The scripted version of the scene where the Doctor and Sarah are locked in a decompression chamber required a practical special effect that was too expensive, so it was discarded and [[Tom Baker]] and [[Elisabeth Sladen]] were allowed to devise their own scene.
* [[Nicholas Courtney]] recalled that his relationship with [[Tom Baker]] changed during the shoot, but not for the better. "He was less congenial, and hyper-sensitive to criticism. I think he was off on his own plane, and the rest of us had to scramble to keep up with him". According to Courtney, "the tension turned ugly once", when Baker was handed some uncomplimentary notes and lashed out. "He'd had the part for a year and didn't take kindly to being treated like an incompetent neophyte".
* [[Nicholas Courtney]] suggested to [[Philip Hinchcliffe]] that the Brigadier be killed off in this story, as he felt he would no longer be required in the show's new format. Hinchcliffe turned down the idea, however, feeling that it would be an inappropriate fate for a character who had been so vital to the programme.
* The script originally placed a far greater emphasis on the Skarasen and the loch. [[Robert Holmes]] felt that the Zygons were more interesting characters as they could interact with the main cast.
* [[Ian Marter]] found [[John Woodnutt]] funny in rehearsals, so location filming saw him giggly when he was supposed to be scared.
* [[John Woodnutt]] spent a lot of time getting the Laird's accent right, pointing out that a Laird would probably have been educated at Eton and would therefore sound English. However, [[Douglas Camfield]] wanted a Scottish accent. The end result is a compromise.
* [[Nicholas Courtney]] claimed to have been unhappy making the story, as he thought he would be playing the Brigadier for the last time. He felt sad that the character faded away in such a manner.
* [[Philip Hinchcliffe]] thought this was where [[Tom Baker]] finally got his performance spot on.
* This is the first television story since [[TV]]: ''[[The Dæmons (TV story)|The Dæmons]]'' to be penned by somebody who had never written for the series before.
* [[Robert Banks Stewart]] wasn't interested in writing outer space stories, so he set the story in his native Scotland and used the Loch Ness Monster because he felt that its lack of detail made an ideal monster.
* The original cliffhanger for Episode Two involved the Skarasen attacking the Doctor as he rowed upon its waters, rather than traversing Tulloch Moor.
* Sister Lamont was originally named Sister White, Stansbridge House was originally named Stansgate House and Hibernian Oil was originally named Claymore Oil.
* [[Douglas Camfield]] had taken a five-year sabbatical from the series having suffered a heart attack during the production of ''[[Inferno (TV story)|Inferno]]''. He was lured back by the premise of this story.
* [[Douglas Camfield]] found that, when moving, the Skarasen appeared more comical than threatening, and so he decided to use as little footage of it as possible. Instead, new material was written for part two which explained that the Zygons had deployed nerve gas on the denizens of Tulloch to allow the Skarasen to pass by unobserved.
* The Doctor dons Scottish garb when arriving in Scotland. Four future actors to play the Doctor would be Scottish - [[Sylvester McCoy]], [[David Tennant]], [[Peter Capaldi]] and [[Ncuti Gatwa]].


==Novelisation==
=== Ratings ===
[[Image:Loch Ness Monster novel.jpg|right|75px]]
* Part one - 8.4 million viewers
: ''Main article: [[Doctor Who and the Loch Ness Monster]]''
* Part two - 6.1 million viewers
* Part three - 8.2 million viewers
* Part four - 7.2 million viewers


*Novelised as ''[[Doctor Who and the Loch Ness Monster]]'' by [[Terrance Dicks]] in [[1976]].
=== Filming locations ===
* Climping Beach, Littlehampton, [[West Sussex]]
* Hall Aggregates [[Quarry]], Storrington, West Sussex
* Furnace Pond, Mill Lane, Crabtree, West Sussex
* Millbank, London
* Ambersham Common, South Ambersham, West Sussex
* Charlton, West Sussex
* [[Westminster Bridge]], Westminster, [[London]]
* [[BBC Television Centre]] (TC3 &amp; TC4), Shepherd's Bush, [[London]]


==External Links==
=== Production errors ===
* [http://www.bbc.co.uk/doctorwho/classic/episodeguide/terrorzygons/ BBC Episode Guide to '''Terror of the Zygons''']
{{discontinuity}}
* [http://www.gallifreyone.com/episode.php?id=4f Outpost Gallifrey Episode Guide: '''Terror of the Zygons''']
* When the Doctor is running from from the [[Skarasen]], he leaves open the driver's door to the Land Rover he was driving. Later, when the Brigadier and Sarah-Jane drive by, both the driver's and passenger's doors of the Land Rover are closed. (Although the camera turns away, following Tom Baker, you can just hear the sound of the door swinging shut.)
* [http://www.drwhoguide.com/who_4f.htm Doctor Who Reference Guide: Detailed Synopsis - '''Terror of the Zygons''']
* While the Doctor and the Zygons' captives are running away from the Zygon spaceship before it explodes, the ship's shadow moves.
* [http://www.shannonsullivan.com/drwho/serials/4f.html A Brief History of Time (Travel) Guide to '''Terror of the Zygons''']
* When the Brigadier and the Doctor examine the dead soldier's body in part two, one of the soldier's fingers moves.
*[http://www.doctorwholocations.net/stories/terrorofthezygons The Locations Guide to Doctor Who - '''Terror of the Zygons''']
* When the Caber jams the door of the Zygon ship by breaking off one of the mechanisms of the control panel, the whole wall of the ship shakes.


{{season 13}}
== Continuity ==
{{TV stub}}
* The Doctor answers a summons from [[Alistair Gordon Lethbridge-Stewart|the Brigadier]]. ([[TV]]: ''[[Revenge of the Cybermen (TV story)|Revenge of the Cybermen]]'', ''[[Disney Time (TV story)|Disney Time]]'')
[[Category:Fourth Doctor episodes]]
* The [[Sixth Doctor]] suggests an additional possible explanation of the [[Loch Ness Monster]] legend. ([[TV]]: ''[[Timelash (TV story)|Timelash]]'')
[[Category:Sarah Jane Smith episodes]]
* The [[Seventh Doctor]] mentions "the [[Zygon]] Gambit" to [[Ace]]. ([[TV]]: ''[[Remembrance of the Daleks (TV story)|Remembrance of the Daleks]]'')
[[Category:Brigadier Lethbridge-Stewart episodes]]
* During [[Sarah Jane Smith]]'s comparison of travels with [[Rose Tyler|Rose]], she mentions the [[Loch Ness Monster]], which seems to impress Rose. ([[TV]]: ''[[School Reunion (TV story)|School Reunion]]'')
[[Category:UNIT episodes]]
* [[PROSE]]: ''[[The Bodysnatchers (novel)|The Bodysnatchers]]'' and [[PROSE]]: ''[[Sting of the Zygons (novel)|Sting of the Zygons]]'' feature the [[Zygon]]s and [[Skarasen]].
* [[AUDIO]]: ''[[The Zygon Who Fell to Earth (audio story)|The Zygon Who Fell to Earth]]'' features the [[Zygon]]s and [[Skarasen]]. [[AUDIO]]: ''[[Death in Blackpool (audio story)|Death in Blackpool]]'' also features the Zygons.
* [[Harry Sullivan]] opts not to continue travelling with the Doctor, having finally arrived home after his somewhat unwitting time in the TARDIS began. ([[TV]]: ''[[Robot (TV story)|Robot]]'') Sarah and the Doctor will soon encounter him again, however. ([[TV]]: ''[[The Android Invasion (TV story)|The Android Invasion]]'')
* The destruction of the [[Zygor|Zygon homeworld]] would later be revealed to have been caused by the [[Last Great Time War|Time War]]. ([[TV]]: ''[[The Day of the Doctor (TV story)|The Day of the Doctor]]'')
 
== DVD, Video, CD and Laserdisc releases ==
=== DVD releases ===
A DVD was commissioned in April 2011, and subsequently announced for release in the UK on [[30 September (releases)|30 September]] [[2013 (releases)|2013]]. However, an "advance release", minus extra features, was also announced for release on [[29 July (releases)|29 July]] 2013 as part of the UK-exclusive ''The Fourth Doctor Time Capsule'' box set, limited to 5,000 copies.[http://www.doctorwhonews.net/2013/07/thefourth-090713103008.html] At the time it held the distinction of being the final complete classic-era story to see a DVD release, before ''[[The Enemy of the World (TV story)|The Enemy of the World]]'' was announced as having been found.
 
===== Special Features =====
* Director's Cut - An option to watch the Director's Cut of part one including a scene deleted before transmission
* Commentary with producer [[Philip Hinchcliffe]], writer [[Robert Banks Stewart]], production unit manager [[George Gallaccio]], make-up designer [[Sylvia James]] and special sounds designer [[Dick Mills]]. Moderated by [[Mark Ayres]].
* ''[[Scotch Mist in Sussex (documentary)|Scotch Mist in Sussex]]'' - Cast and crew look back at the making of this story. With actors [[John Levene]] and [[John Woodnutt]], producer Philip Hinchcliffe, writer Robert Banks Stewart, designer [[Nigel Curzon]], costume designer [[James Acheson]], visual effects assistant [[Steve Bowman]], writer and historian [[Simon Farquar]] and the director's son, [[Joggs Camfield]]
* ''[[Remembering Douglas Camfield (documentary)|Remembering Douglas Camfield]]'' - The life and work of respected director [[Douglas Camfield]] is remembered in this documentary. With actors [[Celia Imrie]], [[Peter Purves]], [[Jonathan Newth]] and John Levene, Philip Hinchcliffe, Robert Banks Stewart, director [[Graeme Harper]] and Joggs Camfield. Narrated by [[Glen Allen]]
* ''[[The UNIT Family (documentary)|The UNIT Family - Part Three]]'' - The concluding part of the series looking at the stories featuring the [[UNIT|United Nations Intelligence Taskforce]]. With actors [[Tom Baker]], [[Nicholas Courtney]], [[Katy Manning]], John Levene and [[Richard Franklin]], producer [[Barry Letts]] and script editor [[Terrance Dicks]]
* ''[[Doctor Who Stories: Tom Baker (documentary)|Doctor Who Stories - Tom Baker]]'' - Tom Baker talks about his work on the series in this interview originally recorded for 2003's ''[[The Story of Doctor Who]]''
* ''[[Doctor Who Stories: Elisabeth Sladen (documentary)|Doctor Who Stories - Elisabeth Sladen]]'' - [[Elisabeth Sladen]] remembers her time as [[Sarah Jane Smith]] in this interview recorded for The Story of ''Doctor Who''
* ''South Today'' - Tom Baker interviewed on location in Sussex during the ''Terror of the Zygons'' filming by the BBC's regional news programme ''South Today''
* ''Merry-Go-Round'' - The Fuel Fishers - Elisabeth Sladen flies out to visit North Sea oil rigs and learn about the process of oil exploration in this schools programme from 1977
* Isolated Music - The option to watch this story with the isolated score enabled
* Photo Gallery
* Coming Soon Trailer - ''[[The Moonbase (TV story)|The Moonbase]]''
* ''[[Radio Times]]'' Listings
* Production Information Subtitles
* Optional Dolby Digital 5.1 Soundtrack
* [[Easter Egg]]s:
** ''[[Disney Time (TV story)|Disney Time]]''. To access this hidden feature, press left at ''Remembering Douglas Camfield'' on Disc Two to reveal a hidden ''[[Doctor Who]]'' logo.
** Deleted scene film inserts. To access this hidden feature, press left at ''South Today'' on Disc Two to reveal a hidden ''Doctor Who'' logo.
 
<gallery position="center" captionalign="center" hideaddbutton="true">
File:Terror-of-the-Zygons-UK-DVD.jpg|Region 2 DVD cover
File:Terror of the Zygons (The Fourth Doctor Time Capsule DVD).jpg|''The Fourth Doctor Time Capsule'' Region 2 DVD cover
File:Terror of the zygons.jpg|Region 1 DVD cover
File:Terror of the zygons australia dvd.jpg|Region 4 DVD cover
</gallery>
 
=== VHS releases ===
This story was released as ''[[Doctor Who]]: Terror of the Zygons'' on VHS.
 
Released:
* [[Australia]] [[April (releases)|April]] [[1987 (releases)|1987]] (Movie Format)
::PAL - [[Polygram]]
::BBCV20552
* [[UK]] [[November (releases)|November]] [[1988 (releases)|1988]] (Movie Format)
::PAL - [[BBC Video]]
::BBCV4186
* [[UK]] [[June (releases)|June]] [[1999 (releases)|1999]] (Episodic Format)
::PAL - [[BBC Video]]
::BBCV6774
* [[USA]] [[1991 (releases)|1991]] (Movie Format - unconfirmed)
::NTSC - [[Playhouse]]
::5422
 
Notes:
* Minor cuts were reportedly made on both the UK compilation and episodic releases to the scene in part two where Harry's Zygon replica threatens Sarah with a pitchfork in the barn, to obtain a "PG" certificate.
* The 1999 episodic release also featured at the start of the tape footage of Tom Baker as the Doctor on the Summer Bank Holiday Monday edition of ''Disney Time'', originally transmitted [[25 August (releases)|25 August]] [[1975 (releases)|1975]].
* The 1988 compilation video release was previously only available in Australia.
 
<gallery position="center" captionalign="center" hideaddbutton="true">
File:Terror of the Zygons VHS Australian cover.jpg|Australian VHS 1987 cover
File:Terror of the Zygons VHS UK cover.jpg|UK VHS 1988 cover
File:Terror of the Zygons VHS US cover.jpg|US VHS 1991 cover
File:Terror of the Zygons VHS UK rerelease cover.jpg|UK VHS 1999 cover
File:Terror of the Zygons VHS Australian rerelease cover.jpg|Australian VHS 2000 cover
File:Terror of the Zygons VHS US rerelease cover.jpg|US VHS 2000 cover
</gallery>
 
=== Laserdisc release ===
Released:
 
* [[UK]] [[February]] [[1998]] (Episodic Format)
::PAL - [[Encore Entertainment]] EE1203
 
<gallery position="center" captionalign="center" hideaddbutton="true">
File:Terror of the Zygons Laserdisc UK cover.jpg|[[Laserdisc]] cover
File:Terrorlaser.PNG|Laserdisc cover and laserdisc
</gallery>
 
=== CD release ===
* In [[2000 (releases)|2000]] the soundtrack of ''Terror of the Zygons'' was released with ''[[The Seeds of Doom (TV story)|The Seeds of Doom]]''.
<gallery position="center" captionalign="center" hideaddbutton="true">
Terror of the Zygons soundtrack cd.jpg|CD release
Terror of the zygons cd.jpg|Whole cover
</gallery>
 
== External links ==
* {{bbcepguideclassic|terrorzygons/|Terror of the Zygons}}
* {{radiotimes|2010-06-27/terror-of-the-zygons|Terror of the Zygons}}
{{dwcast}}
{{dwrefguide|who_4f.htm|Terror of the Zygons}}
* {{briefhistory|serials/4f.html|Terror of the Zygons}}
* {{locguide|terrorofthezygons|Terror of the Zygons}}
{{DWTV}}
{{UNIT stories}}
{{Zygon stories}}
{{TitleSort}}
[[es:Terror of the Zygons]]
[[ru:Террор зайгонов]]
 
[[Category:Doctor Who (1963) television stories]]
[[Category:Stories set in the 20th century]]
[[Category:Brigadier Lethbridge-Stewart television stories]]
[[Category:UNIT television stories]]
[[Category:Stories set in Scotland]]
[[Category:Stories set in Scotland]]
[[Category:1975 television stories]]
[[Category:1975 television stories]]
[[Category:Stories set in the City of Westminster]]
[[Category:Season 13 stories]]
[[Category:Zygon television stories]]
[[Category:Four part serials]]
[[Category:The Monster Collection: The Zygons stories]]

Latest revision as of 20:06, 3 November 2024

RealWorld.png

Terror of the Zygons was the first serial of season 13 of Doctor Who. It had been originally produced to conclude season 12 and saw the last regular appearance of Ian Marter as Harry Sullivan and was the first UNIT story since Robot. Although two more UNIT stories followed later this season, this was the last appearance of the Brigadier until 1983's Mawdryn Undead.

Originally a six parter entitled The Secret of Loch Ness, it was condensed down to four by script editor Robert Holmes; no significant plot threads were lost in the rewriting. (INFO: Terror of the Zygons)

The ending of the TV special Disney Time, broadcast just a few days earlier, was designed to tie into the beginning of the serial, as it showed the Doctor receiving the message which sends him to the Brigadier at the beginning of Terror of the Zygons.

Synopsis[[edit] | [edit source]]

Having received an urgent request for assistance from the Brigadier, the Doctor, Sarah and Harry arrive in Scotland, where they discover that a mysterious force has destroyed three oil rigs.

The mystery deepens when a piece of wreckage is found with giant teeth marks on it. The trail leads them to the shores of Loch Ness where they find that the legendary monster really does exist — and is the murderous tool of the Zygons, aliens intent on overpowering the planet.

The Doctor, his companions and UNIT must find a way to defeat the deadly Loch Ness Monster and its controllers, but the Zygons have the terrifying power to change shape. The Doctor's life has never been in more danger, as the line between allies and enemies is tested to the very limit...

Plot[[edit] | [edit source]]

Part one[[edit] | [edit source]]

On an oil rig off the coast of Scotland, a strange, high-pitched beeping sound echoes through the structure. The rig begins to break apart, collapsing into the North Sea. A radio operator tries to send a mayday, but his efforts are in vain.

The Fourth Doctor, Harry and Sarah hitch a ride with a motorist to the town where the Brigadier and UNIT have set themselves up in an inn. The Brigadier is talking to Huckle, an official of Hibernian Oil, who owned the rig. Huckle complains that three rigs have been destroyed in the last month, two of them belonging to Hibernian. The Brigadier assures Huckle that UNIT is also concerned, especially about the loss of life.

The Doctor, Harry and Sarah arrive at the inn. It turns out that the man who has given them a lift is the Duke of Forgill, a local landowner. The Duke is angry about Huckle's men trespassing on his land. Huckle assures him that he has warned his employees about this, and any who are caught will be dismissed without question. However, the Duke warns that any of Huckle's men caught on his land will be shot. He also wants to know what UNIT are doing here, but the Brigadier says that it is a sensitive matter. Though not pleased, the Duke leaves.

On the shoreline, a survivor of the destroyed rig washes up, barely alive.

The Brigadier brings the Doctor, Harry and Sarah to Hibernian Oil, where Huckle briefs them on the injuries of the rigs' crew. Harry decides to examine the injuries at the sickbay, while Sarah goes to talk to some of the locals. Huckle cannot understand it: the rigs were designed to be unsinkable and the seas were calm and empty before the incidents. The Doctor darkly notes that the sea may be calm but is never empty.

Back at the inn, Sarah talks to Angus, the landlord. She admires a stuffed stag's head above the fireplace, a gift from the Duke just this past week. Angus observes that the Duke has not been himself since the oil companies came. His servants have all left to go and work for them, leaving Forgill Castle cold and empty. He tells Sarah about Tulloch Moor and people disappearing over the centuries when the mist comes down. Sarah is sceptical — evil spirits do not destroy oil rigs. All this while, something alien watches Angus and her on a monitor screen.

The Duke's man, Caber, sees the rig survivor, Munro, stagger from the surf. Harry is driving by and goes to Munro as he collapses. Before Munro can tell Harry about what smashed the rig, Caber fires a rifle, killing Munro and creasing Harry's forehead with a second shot. Harry falls, unconscious. Back at the inn, the Doctor is working on a radio probe to check for localised jamming when a call comes in informing them about Harry.

Alien hands manipulate strange, organic controls. A high-pitched beeping summons a creature from the depths. It heads towards the Ben Nevis rig. The rig's communications with Huckle are jammed.

The Doctor and Sarah visit Harry, who is sedated and being tended by Sister Lamont, the nurse. The Brigadier arrives to tell him of the Ben Nevis rig's destruction. Sarah stays with Harry while the Doctor goes with the Brigadier. Outside, the Doctor spots wreckage from the rig with odd holes in it. He asks RSM Benton for plaster of Paris and makes a mould of the holes, revealing that something with very large teeth bit the rig. The watching aliens decide that the Doctor knows too much and must be destroyed.

Harry awakens. Sarah goes to tell the Doctor while Sister Lamont tells Harry he will be very well looked after. A high-pitched beeping echoes through the room, and Harry looks up in fear. As Sarah calls the Doctor, a suction-tipped hand clamps down on her shoulder. She turns as she is grabbed by a large, orange biped creature.

Part two[[edit] | [edit source]]

The Doctor hears Sarah's cries over the telephone and rushes to the sickbay. Sister Lamont tells them that she found Sarah gone and Harry's bed empty. The Doctor snoops around and finds Sarah unconscious in a decompression chamber. As Sarah comes round and starts telling the Doctor about what happened, a Zygon locks them in and starts to remove the air from the chamber. To escape death, the Doctor hypnotises Sarah into not needing to breathe and then puts himself in a similar trance.

The Zygons spy on the Doctor.

Harry is brought to the Zygon ship deep underwater, where he meets their warlord, Broton. Centuries ago, their spaceship was damaged, and they landed on Earth. They were waiting for rescue when they heard that their world had been destroyed in a stellar explosion. Now, they intend to claim Earth for their own, using the sea monster under their command, an armoured cyborg of great power. Broton explains that the Zygons depend on the lactic fluid of the Skarasen. Harry realises that if the monster is destroyed, the Zygons will die. Broton declares that no human weapon can affect the Skarasen.

The Brigadier is briefing one of his officers at the inn when gas floods the room, knocking them all out. Meanwhile, Sergeant Benton has found the Doctor and Sarah. He opens the pressure door. The Doctor exhales, awakens and carefully revives Sarah. He tells Benton that the trance was a trick he picked up from a Tibetan monk.

The Doctor, Sarah and Benton find the entire village has been drugged by some kind of nerve gas, but the people soon revive. The Doctor deduces that this was done so that something could get around unseen. The Zygons watch Huckle give the Doctor a device he found in the wreckage: the signal device that summons the Skarasen. Broton says that it must be recovered. Harry is taken to another room in the ship, where he sees other humans hooked up to booths, providing the Zygons with "body prints" that they use to assume human form.

The Doctor hypothesises that the signal device sends out a primeval mating call to attract the beast. The savaged body of a UNIT soldier is found on the moor, and the Doctor and the Brigadier go to see it, leaving Sarah behind in case Harry turns up. He does, but it is his Zygon duplicate Madra. He takes the signal device, saying that the Doctor asked him to collect it. Sarah notices his curious behaviour and questions him, but he pushes her aside and runs away. Sarah and some soldiers pursue him.

Sarah discovers "Harry" hiding in the upper level of a barn, and he attacks her with a pitchfork. She steps aside at the last moment, and he falls, impaling himself on his weapon and turning back into a Zygon. The signal broken, Broton realises that Madra is dead and remotely disperses the corpse. Harry, however, is freed from his body print booth.

Sarah wonders how the aliens knew they had the signal device. The Brigadier orders the inn searched for bugs. Broton in turn orders the Skarasen unleashed, even if it reveals their presence. The signal device begins to beep. The Doctor grabs it to lure the creature away, while the Brigadier tries to get a fix on the activating signal.

The Skarasen catches up to the Doctor on the moor, and he finds that he cannot get rid of the semi-organic signal device which has fastened itself to his palm. The Brigadier traces the incoming signal to Loch Ness. As the Doctor stumbles, Broton orders the Skarasen to destroy him.

Part three[[edit] | [edit source]]

Harry rushes into the Zygon control room and randomly hits controls, making the device fall off the Doctor's palm and allowing him to roll out of the Skarasen's way. Since the device is dead, Broton assumes that the Doctor is too and recalls the Skarasen. The Doctor retrieves the device and makes his way back across the moor as the Skarasen glides away. In the ship, Harry is dragged away by the other Zygons.

The Doctor is met halfway by the Brigadier and Sarah, who tell him that the signal came from Loch Ness. The Doctor decides to visit Forgill Castle, right next to the loch. They get a frosty reception from the Duke, who does not believe them about the monster or the aliens and is unhappy with their intention to drop depth charges in Loch Ness.

At the inn, Angus discovers the Zygon surveillance link in the stuffed deer head that was the Duke's gift. As he tries to pry it loose, Sister Lamont enters the inn. The sister turns into a Zygon and kills him, removing the link after. Angus' dying cries are heard by Benton and some UNIT soldiers, who discover the body and pursue the killer. The UNIT troops sweep through the nearby forest and fire on the Zygon.

The Brigadier is told that a Zygon is being cornered. He and the Doctor leave Sarah at the castle to research the monster. In the woods, the wounded Zygon disguises itself again as Sister Lamont and fools a UNIT soldier long enough to knock him out and steal his jeep. At the inn, the Doctor notices the missing eye in the deer head and realises that the Duke may be a Zygon facsimile.

At the castle, Sarah examines the upper bookshelves. She triggers a hidden switch, and a section of the bookcases slides open, revealing a passage. She takes a torchlight and goes in, following a long dark tunnel that leads to the Zygon ship. "The Duke" (in reality Broton) finds the open bookcase. He and "Caber" take the wounded "Sister Lamont" (the Zygon Odda) into the ship; the crew must be alerted and the intruder found and destroyed.

Sarah finds the cell where Harry is held. She frees him, and they sneak back to the castle, just in time to meet the Brigadier and the Doctor. Sarah tells the Brigadier about the Zygon ship. The Doctor enters the tunnel but does not get far; a scream is heard. The Zygons emerge in their true forms. Broton tells the humans that they are leaving with the Doctor as their prisoner. He warns them that the oil rigs were only a test; the "big event" is yet to come. Broton retreats, sealing the entrance to the tunnel.

The Brigadier orders the loch depth-charged to bring the Zygon ship to the surface. The Zygon ship does rise but keeps on rising into the sky, flying away.

Part four[[edit] | [edit source]]

Broton orders a jamming signal transmitted to block the humans' radar systems. The Brigadier prepares to move his troops out, but Sarah and Harry suggest they search Forgill Castle before they leave for clues to the Zygons' plans. Sarah finds some papers that indicate the Duke is the President of the Scottish Energy Commission, but Harry dismisses the information as useless. They return with the Brigadier to London.

The Zygon ship lands in a disused quarry. UNIT cannot track it. Radar stations are knocked out all over the country. However, there are reports of a large underwater object heading south at high speed. Broton enters the Doctor's cell and, taking the Duke's form again, tells him that Phase I of the conquest of Earth is complete. A great Zygon refugee ship is on its way but will take some centuries to arrive. In the meantime, Earth's environment must be restructured with human labour and Zygon technology to turn it into a new homeworld.

Left alone, the Doctor rigs some of the organic technology in his cell, electrocuting himself but sending a transmission to help UNIT track the ship to the quarry. By the time Broton and his men open the Doctor's cell door, the Doctor is apparently dead. However, when Broton leaves, the Doctor comes to. He makes his way to the body print chamber and frees the real Duke, Sister Lamont and Caber.

Broton leaves the ship to plant a trilanic activator on his target, which the Skarasen will then destroy, proving the power the Zygons hold. When Phase II is complete, he will broadcast his demands to the world. Inside the ship, the Doctor uses his sonic screwdriver to set off the fire sensor, triggering an alarm. When the Zygons go to investigate, the Doctor ushers the humans out of the ship, jamming the hatches and activating the ship's self-destruct.

The Doctor, Sarah Jane, Harry, the Brigadier and the Duke of Forgill look upon the TARDIS.

The Brigadier has arrived, and the escapees reach UNIT's position. The Doctor shouts for everyone to get down, just before the Zygon ship explodes. However, Broton is still free and has control of the Skarasen. The target is in London and must be close to the River Thames.

The Brigadier says the Prime Minister will be at a conference at Stanbridge House, near the river. The Duke adds it is the first International Energy Conference, with delegates from all over the world. As the Duke is the President of the Scottish Energy Commission, Broton will have a pass into the meeting. They leave for London.

"The Duke" places the activator in the basement of Stanbridge House. The Skarasen has been sighted mere minutes away. The Doctor finds Broton, back in his true form, who swears he will make sure the Doctor is dead this time and attacks him. Sarah calls for the Brigadier, who arrives to shoot Broton dead. The Doctor finds the trilanic activator in his pocket and feeds it to the Skarasen as it rises out of the Thames. After it consumes the device, the beast sinks back into the river and heads back to Loch Ness, the only home it has ever known. However, it is witnessed by not only the Doctor, Sarah and Harry, but many terrified Londoners.

Returning to Scotland, the Brigadier tells the Duke that the incident will be kept quiet, even the appearance of a fifty foot monster in the Thames. The Doctor leads them into the woods to the TARDIS and offers all of them a lift. The Brigadier and Harry decline. Sarah agrees on the condition they go straight back to London. The Doctor promises, and the TARDIS takes off with the Doctor and Sarah inside. The Duke tells the Brigadier that, as a Scotsman, he should have gotten a refund for Sarah and the Doctor's return train tickets.

Cast[[edit] | [edit source]]

Uncredited cast[[edit] | [edit source]]

Crew[[edit] | [edit source]]

Uncredited crew[[edit] | [edit source]]

Worldbuilding[[edit] | [edit source]]

The Doctor's items[[edit] | [edit source]]

Music[[edit] | [edit source]]

Organisations[[edit] | [edit source]]

Technology[[edit] | [edit source]]

Vehicles[[edit] | [edit source]]

Influences[[edit] | [edit source]]

  • Robert Banks Stewart was largely unfamiliar with the series, so he wrote the Doctor, Sarah and Harry in the style of the main characters in The Avengers, which he had previously written for.

Story notes[[edit] | [edit source]]

  • This story had working titles of: Loch Ness, The Secret of the Loch, Secret of Loch Ness, The Loch Ness Monster and The Zygons.
  • This story was originally planned to end season 12, but was pushed back to the start of season 13 to allow the series to shift its broadcast schedule from a January start (its routine since 1970) to September.[1]
  • Nicholas Courtney is credited as "Brigadier" in Radio Times for part four.
  • Radio Times credits John Woodnutt as "Duke of Forgill" for part one, "Broton" for parts two and three, and "Broton/Duke of Forgill" for part four. All on-screen credits read "Duke of Forgill".
  • The Radio Times programme listing for part one was accompanied by a black-and-white illustration by Frank Bellamy depicting the Doctor in his tam-o'-shanter, the oil rig being destroyed and the Skarasen's eye, with the accompanying caption "A tartan touch for Dr. Who when he faces a new breed of monsters that bring terror to the North Sea: 5.45".
  • Radio Times art editor David Driver commissioned a full colour illustration from Frank Bellamy — depicting the Zygon spaceship taking off, the Doctor and the Skarasen, with a comic strip style speech balloon for the Doctor reading "WE'RE DEALING WITH A CREATURE THAT IS NOT OF ORDINARY FLESH AND BLOOD..." — in the hope it would be used as a front cover for the forthcoming 30 August–5 September 1975 issue to tie-in with the start of season 13. This never happened, but the artwork eventually saw print as part of Still waters, a two-page Radio Times article by Andrew Haden-Guest about the Loch Ness monster which featured in that issue. The introduction for the article read "Dr. Who / Saturday BBC1 / What is Nessie? Who can tell? In a new series starting this week, Dr. Who takes on the unidentified incumbent of Loch Ness. Here Anthony Haden-Guest plumbs the depths of the Scottish mystery". (original published text)
  • This is the only season opener to feature a companion departure, though Harry would return later in season 13 for The Android Invasion.
  • The departure of Harry while Sarah remains with the Doctor marks one of only two incontrovertible times in the televised classic series that a companion, who had already been with the Doctor before another one joins, remains with him after the second companion leaves. Jamie arrived before Victoria Waterfield and remained after her departure. Two other arguable examples would be Katarina and Sara Kingdom, who weren't with the Doctor very long, and ended up dying. Generally, the Doctor's roster of companions revolves fairly consistently.
  • This was the only on-screen appearance of the Zygons, save for flashbacks and verbal references, during the classic series. A Zygon was apparently to have appeared, along with a Dalek and a Cyberman, among the alien prisoners on the Time Lords' prison planet in Douglas Adams's original script of Shada, but the scenes set inside Shada itself were never recorded. The Zygons made their first on-screen appearance in the revived series in the Doctor Who 50th Anniversary episode, The Day of the Doctor, an episode which also featured the return of Tom Baker in a special cameo.
  • On the DVD release of this story, it featured a deleted scene set at the start of the story featuring the TARDIS materialising invisibly due to a faulty fusion plate. It was in a mixture of colour and black-and-white, but the monochrome sections were recoloured manually by the YouTuber Stuart Humphryes, a.k.a. Babelcolour, who also worked on The Mind of Evil and Genesis of the Daleks DVDs. The original unrestored colour and black-and-white version is included on the DVD as an Easter egg.
  • Margaret Thatcher had been elected Leader of the Conservative Party in February 1975, a few weeks before the story began production. Knowing that the UNIT stories were intended to be set a few years in the future, Nicholas Courtney ad-libbed the reference to the Prime Minister as “Madam” to suggest Thatcher was in office by the time the story was set.
  • This is, effectively, the earliest Doctor Who story directed wholly by Douglas Camfield to survive in its entirety. On Planet of Giants, Camfield only directed the final episode whilst on Inferno he did not direct most of the studio scenes due to falling ill with a heart condition. The Crusade, The Daleks' Master Plan, The Web of Fear and The Invasion are all missing episodes; and The Time Meddler is missing approximately twelve seconds of footage from its last episode, "Checkmate".
  • The scripted version of the scene where the Doctor and Sarah are locked in a decompression chamber required a practical special effect that was too expensive, so it was discarded and Tom Baker and Elisabeth Sladen were allowed to devise their own scene.
  • Nicholas Courtney recalled that his relationship with Tom Baker changed during the shoot, but not for the better. "He was less congenial, and hyper-sensitive to criticism. I think he was off on his own plane, and the rest of us had to scramble to keep up with him". According to Courtney, "the tension turned ugly once", when Baker was handed some uncomplimentary notes and lashed out. "He'd had the part for a year and didn't take kindly to being treated like an incompetent neophyte".
  • Nicholas Courtney suggested to Philip Hinchcliffe that the Brigadier be killed off in this story, as he felt he would no longer be required in the show's new format. Hinchcliffe turned down the idea, however, feeling that it would be an inappropriate fate for a character who had been so vital to the programme.
  • The script originally placed a far greater emphasis on the Skarasen and the loch. Robert Holmes felt that the Zygons were more interesting characters as they could interact with the main cast.
  • Ian Marter found John Woodnutt funny in rehearsals, so location filming saw him giggly when he was supposed to be scared.
  • John Woodnutt spent a lot of time getting the Laird's accent right, pointing out that a Laird would probably have been educated at Eton and would therefore sound English. However, Douglas Camfield wanted a Scottish accent. The end result is a compromise.
  • Nicholas Courtney claimed to have been unhappy making the story, as he thought he would be playing the Brigadier for the last time. He felt sad that the character faded away in such a manner.
  • Philip Hinchcliffe thought this was where Tom Baker finally got his performance spot on.
  • This is the first television story since TV: The Dæmons to be penned by somebody who had never written for the series before.
  • Robert Banks Stewart wasn't interested in writing outer space stories, so he set the story in his native Scotland and used the Loch Ness Monster because he felt that its lack of detail made an ideal monster.
  • The original cliffhanger for Episode Two involved the Skarasen attacking the Doctor as he rowed upon its waters, rather than traversing Tulloch Moor.
  • Sister Lamont was originally named Sister White, Stansbridge House was originally named Stansgate House and Hibernian Oil was originally named Claymore Oil.
  • Douglas Camfield had taken a five-year sabbatical from the series having suffered a heart attack during the production of Inferno. He was lured back by the premise of this story.
  • Douglas Camfield found that, when moving, the Skarasen appeared more comical than threatening, and so he decided to use as little footage of it as possible. Instead, new material was written for part two which explained that the Zygons had deployed nerve gas on the denizens of Tulloch to allow the Skarasen to pass by unobserved.
  • The Doctor dons Scottish garb when arriving in Scotland. Four future actors to play the Doctor would be Scottish - Sylvester McCoy, David Tennant, Peter Capaldi and Ncuti Gatwa.

Ratings[[edit] | [edit source]]

  • Part one - 8.4 million viewers
  • Part two - 6.1 million viewers
  • Part three - 8.2 million viewers
  • Part four - 7.2 million viewers

Filming locations[[edit] | [edit source]]

Production errors[[edit] | [edit source]]

If you'd like to talk about narrative problems with this story — like plot holes and things that seem to contradict other stories — please go to this episode's discontinuity discussion.
  • When the Doctor is running from from the Skarasen, he leaves open the driver's door to the Land Rover he was driving. Later, when the Brigadier and Sarah-Jane drive by, both the driver's and passenger's doors of the Land Rover are closed. (Although the camera turns away, following Tom Baker, you can just hear the sound of the door swinging shut.)
  • While the Doctor and the Zygons' captives are running away from the Zygon spaceship before it explodes, the ship's shadow moves.
  • When the Brigadier and the Doctor examine the dead soldier's body in part two, one of the soldier's fingers moves.
  • When the Caber jams the door of the Zygon ship by breaking off one of the mechanisms of the control panel, the whole wall of the ship shakes.

Continuity[[edit] | [edit source]]

DVD, Video, CD and Laserdisc releases[[edit] | [edit source]]

DVD releases[[edit] | [edit source]]

A DVD was commissioned in April 2011, and subsequently announced for release in the UK on 30 September 2013. However, an "advance release", minus extra features, was also announced for release on 29 July 2013 as part of the UK-exclusive The Fourth Doctor Time Capsule box set, limited to 5,000 copies.[2] At the time it held the distinction of being the final complete classic-era story to see a DVD release, before The Enemy of the World was announced as having been found.

Special Features[[edit] | [edit source]]
  • Region 2 DVD cover

    Region 2 DVD cover

  • The Fourth Doctor Time Capsule Region 2 DVD cover

    The Fourth Doctor Time Capsule Region 2 DVD cover

  • Region 1 DVD cover

    Region 1 DVD cover

  • Region 4 DVD cover

    Region 4 DVD cover

VHS releases[[edit] | [edit source]]

This story was released as Doctor Who: Terror of the Zygons on VHS.

Released:

PAL - Polygram
BBCV20552
PAL - BBC Video
BBCV4186
PAL - BBC Video
BBCV6774
  • USA 1991 (Movie Format - unconfirmed)
NTSC - Playhouse
5422

Notes:

  • Minor cuts were reportedly made on both the UK compilation and episodic releases to the scene in part two where Harry's Zygon replica threatens Sarah with a pitchfork in the barn, to obtain a "PG" certificate.
  • The 1999 episodic release also featured at the start of the tape footage of Tom Baker as the Doctor on the Summer Bank Holiday Monday edition of Disney Time, originally transmitted 25 August 1975.
  • The 1988 compilation video release was previously only available in Australia.
  • Australian VHS 1987 cover

    Australian VHS 1987 cover

  • UK VHS 1988 cover

    UK VHS 1988 cover

  • US VHS 1991 cover

    US VHS 1991 cover

  • UK VHS 1999 cover

    UK VHS 1999 cover

  • Australian VHS 2000 cover

    Australian VHS 2000 cover

  • US VHS 2000 cover

    US VHS 2000 cover

Laserdisc release[[edit] | [edit source]]

Released:

PAL - Encore Entertainment EE1203
  • Laserdisc cover

    Laserdisc cover

  • Laserdisc cover and laserdisc

    Laserdisc cover and laserdisc

CD release[[edit] | [edit source]]

  • CD release

    CD release

  • Whole cover

    Whole cover

External links[[edit] | [edit source]]

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Christmas Special
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Regular episodes
Christmas Special
Series 10: 2016-2017
Christmas Special
Regular episodes
Christmas Special
 
Series 11-13: Jodie Whittaker
Series 11: 2018-2019
Regular episodes
New Year Special
Series 12: 2020-2021
Regular episodes
New Year Special
Series 13: 2021
Minisodes
Regular episodes
Seasonal specials
 
60th Anniversary Specials: David Tennant
Specials: 2023
Minisodes
60th Anniversary Specials
 
Season 1 (2023)-present: Ncuti Gatwa
Season 1: 2023-2024
Christmas Special
Regular episodes
v • e
UNIT stories
TV
Doctor Who
Major
Minor
Torchwood
SJA
PROSE
U.N.I.T.
website
UNIT Press
Briefings
Operations
Board
Candy Jar UNIT series
Operation Wildcat and Other Stories
Operation Fall-Out and Other Stories
More to be added
v • e
Zygon stories
For the purposes of this list, a "Zygon story" is one in which one living, authentic Zygon plays a confirmed part within the confines of the story, outside of flashbacks to previous stories and cliffhangers that lead into the following story. For this reason, Death in Heaven is absent due to the ambiguity of a Zygons' presence.
Television
Broadcast
Home video
Audio
Prose
Comics
Video games
Complete list of appearances
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