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{{Infobox ClassicTV|
{{title dab away}}
story name= The Krotons|
{{real world}}
image= [[Image:Krotons_title.jpg|250px]]|
{{ImageLinkTV}}
series=[[Doctor Who]] - [[List of Doctor Who television stories|TV Stories]] |
{{Infobox Story SMW
number= [[Season 6]] |
|image= Krotons title.jpg
story number= 47|
|series=[[Doctor Who television stories|''Doctor Who'' television stories]]
doctor=[[Second Doctor]] |
|season number= Season 6 (Doctor Who 1963)|
companions= [[Jamie McCrimmon]]<br/>[[Zoe Heriot]]|
|season serial number = 4
enemy= <ul><li>[[Kroton|The Krotons]]</li><li>[[Eelek]]</li></ul>|
|story number= 47
year= [[Gond planet]]|
|doctor = Second Doctor  
writer= [[Robert Holmes]] |
|companions= [[Jamie McCrimmon|Jamie]], [[Zoe Heriot|Zoe]]
director= [[David Maloney]] |
|enemy= [[Kroton (species)|Krotons]]
producer= [[Peter Bryant]]|
|setting= [[Planet (The Krotons)|Gond planet]]
broadcast date= [[28th December]] [[1968]] - [[18th January]] [[1969]]|
|writer= Robert Holmes
format= 4 25-minute Episodes |
|director= [[David Maloney]]  
production code= [[List of production codes|WW]]|
|producer= [[Peter Bryant]]
previous story=[[The Invasion]]|
|novelisation= The Krotons (novelisation)
next story= [[The Seeds of Death]]}}
|epcount = 4
|broadcast date= 28 December 1968 - 18 January 1969
|network = BBC1
|format= 4x25-minute episodes
|serial production code= [[List of production codes|WW]]
|prev = The Invasion (TV story)
|next= The Seeds of Death (TV story)
|trailer = Doctor Who - The Krotons - DVD trailer
|clip= Great Jumping Gobstoppers! - The Krotons - Doctor Who - BBC
|bts=
}}
'''''The Krotons''''' was the fourth serial of [[Season 6 (Doctor Who 1963)|season 6]] of ''[[Doctor Who]]''. It was the first story penned by future [[script editor]] [[Robert Holmes]], whose prolific contributions to the series created or contributed to many key elements of the programme's mythology.


'''The Krotons''' was the fourth story of [[Season 6]] of ''[[Doctor Who]]''. Future script editor [[Robert Holmes]] penned this story, his first for the series.
== Synopsis ==
The TARDIS arrives on the planet of the [[Gond]]s, who are ruled and taught in a form of self-perpetuating slavery by the alien [[Kroton (species)|Krotons]] — crystalline beings whose ship, the Dynatrope, crash-landed there thousands of years earlier after being damaged in a space battle.


The Krotons are in suspended animation, in a crystalline slurry form, awaiting a time when they can be reconstituted by absorption of mental energy. Periodically, the two most brilliant Gond students are received into the Dynatrope, nominally to become "companions of the Krotons", but in truth to have their mental energy drained, after which they are killed.


Watch Doctor Who The Krotons Online - http://www.crossingthewhoniverse.com/The-Krotons.html
When the [[Second Doctor]] and Zoe take the students' test, their mental power is sufficient to reanimate the Krotons. The Doctor discovers that their life system is based on tellurium. With help from the Gond scientist Beta, he destroys them and their ship with an impure form of sulphuric acid.


==Synopsis==
== Plot ==
The TARDIS arrives on the unnamed planet of the [[Gond]]s, who are ruled and taught in a form of self-perpetuating slavery by the alien [[Kroton]]s - crystalline beings whose ship, the Dynatrope, crash-landed there thousands of years ago after being damaged in a space battle.
=== Episode one ===
On the planet of the Gonds, a ceremony is underway. The two brightest students, Abu and Vana, have been selected to become "companions" of the Gonds' unseen masters, the Krotons. As Abu eagerly dons his selection robes and enters the Krotons' machine, another Gond, Thara desperately begs Vana not to go. The Gonds argue with him. She has been selected for the highest honour. Those companions who have gone before have never been seen nor heard from again. The Gond leader Selris, Thara's father, is resolute, stating that Kroton law dictates that she must.


The Krotons are at present in suspended animation, in a crystalline slurry form, awaiting a time when they can be reconstituted by absorption of mental energy. Periodically, the two most brilliant Gond students are received into the Dynatrope, apparently to become 'companions of the Krotons' but in truth to have their mental energy drained, after which they are killed.
The Doctor's TARDIS lands in a desolate area nearby. Jamie immediately notes the strong odour of [[sulphur]] whilst the Doctor states that the planet has twin suns. Zoe suggests that they depart, but the Doctor opts to explore. From a clifftop they see the Gond city below. They encounter a metallic crystalline structure with a hatchway similar to the one in the city. Jamie noticed that the smell is stronger. The Doctor is cautious. He identifies the structure as a machine and wants to head back to the TARDIS. As they head off, the door opens, and they hide as a dazed and weary Abu emerges from the hatchway. Before their horrified eyes, he is evaporated by blasts of energy.


When the Doctor and Zoe take the students' test, their mental power is sufficient to reanimate the Krotons. The Doctor discovers that their life system is based on tellurium and, with help from the Gond scientist Beta; he is then able to destroy them and their ship using an impure form of sulphuric acid.
[[File:JamieZoeSkeptical.jpg|thumb|left|[[Jamie McCrimmon|Jamie]] and [[Zoe Heriot|Zoe]] are less than impressed by the [[Second Doctor|Doctor's]] sunny outlook for their landing spot.]]


==Plot==
Thara and Selris argue over Vana's selection. Thara questions if the Krotons even exist. Thara draws a weapon and is soon surrounded by Gonds. The Doctor, Jamie and Zoe enter the city. They are regarded with suspicion; the Gonds have never met strangers before and the area where they landed, the Wasteland, is believed uninhabitable. Meanwhile, the stand-off between Thara and the Gonds continues. Vana wants to go through the door in order to protect Thara. He relents. The Doctor, Jamie and Zoe watch this, and the Doctor tries to stop it, thinking it some kind of sacrifice. The Gonds seize the Doctor and his colleagues for stopping their ritual. As a particularly hotheaded young man named Axus fights with Jamie, Vana rushes into the Kroton machine. Jamie wins the fight with Axus. Selris interrogates the Doctor and his colleagues. The Doctor's description of the death of Abu shocks the crowd, as does the revelation that they have been in the Wasteland. The Doctor, Jamie and Zoe rush back to the Wasteland to rescue Vana, followed by Thara.
[[Image:JamieZoeSkeptical.jpg|thumb|left|[[Jamie]] and [[Zoe]] are less than impressed at the [[Second Doctor|Doctor's]] sunny outlook for their landing spot]]
[[Image:SecondAttackedByKrotonSnake.jpg|thumb|left|The Doctor attacked by Kroton device]]
[[Image:SecondOnScreen.jpg|thumb|The Krotons take notice of the Doctor]]
[[Image:JamieAttackedByKrotons.jpg|thumb|left|Jamie undergoes Kroton mind probe]]
[[Image:DocZoeWorkOutKrotonMystery.jpg|thumb|The Doctor and Zoe come up with a chemical plan]]
===Episode One===
On the planet of the [[Gond]]s, a ceremony is underway. The two brightest students, [[Abu]] and [[Vana]], have been selected to become companions of the Gonds' unseen masters, the [[Kroton]]s. As Abu eagerly dons his selection robes and enters the Krotons' lair, Vana’s lover [[Thara]] desperately begs her not to go. Gond leader [[Selris]], Thara's father, is resolute, stating that Kroton law dictates that she must.


The [[TARDIS]] lands in a desolate area nearby. [[Jamie McCrimmon|Jamie]] immediately notes the strong odor of sulfur, and [[Zoe Herriot|Zoë]] suggests that they depart, but [[Second Doctor|the Doctor]] opts to explore. From a clifftop they see the Gond city below. They encounter a metallic crystalline structure with a hatchway similar to the one in the city. The Doctor is cautious, identifying the structure as a machine, and they hide as a dazed and weary Abu emerges from the hatchway. Before their horrified eyes, he is evaporated by blasts of energy.
They all reach the door. The Doctor sets about finding stones and starts blocking the energy beams with rocks. They hide. Soon Vana appears and swoons. The Doctor swoops in with his [[umbrella]] up to save her. The gas knocks the stones free, which causes the Doctor's umbrella to disintegrate, but everyone is safe. Vana is near-catatonic. They all set off for Selris' house.


As Thara and Selris argue over Vana’s selection, the Doctor, Jamie and Zoë enter the city. They are regarded with suspicion; the Gonds have never encountered strangers before, and the area where they landed, the Wasteland, is believed to be uninhabitable. As a particularly hotheaded young man fights with Jamie, Vana rushes into the Kroton machine. The Doctor’s description of the death of Abu sends shock waves through the crowd. The Doctor, Jamie and Zoë rush back to the Wasteland to rescue Vana, followed by Thara. They block the energy beams with rocks and pull her away as she stumbles from the machine. She is near-catatonic.
Back in the city, the Doctor tends to Vana through [[hypnosis]]. Selris tries to make sense of what is happening. Have they always been [[murder]]ing the selected Gonds? The Kroton machine landed on the planet thousands of years earlier, and the ensuing war nearly annihilated the Gonds and ruined the landscape. Since then, the Krotons have never left their machine.


Back in the city, the Doctor tends to Vana as Selris attempts to make sense of what is happening. The Krotons, he says, have long been the Gonds’ benefactors, providing them with knowledge. The Kroton machine landed on the planet thousands of years earlier, and the ensuing war nearly annihilated the Gonds and ruined the landscape. Since then, the Krotons have never left their machine, but created the teaching machines to train the Gonds, and the laws that require their top students to become companions; the Doctor notes this to be a form of self-perpetuating slavery.
Thara and a band of students sneak into the Learning Hall and interrogate the Curator for information about the Krotons. The Curator states he is forbidden to tell and that they only communicate through messages and, very occasionally, voice. They decide to fetch the Krotons out by smashing their teaching machines.


Thara and a band of students sneak into the Learning Hall and vandalize the Kroton teaching machines to force them to emerge. They are stopped by a bellowing mechanical voice ordering them to leave the hall. As the Doctor and Selris reason with the vandals, a portal opens and a metallic snakelike object emerges and homes in on the Doctor.
The Doctor and his colleagues learn that the Krotons created the teaching machines to train the Gonds on the laws, science and culture that require their top students to become companions; the Doctor notes this is a form of self-perpetuating slavery. Selris panics about what this means for his society. Beta, their chief scientist, arrives and tells Selris of Thara's actions. Selris worries he will not reach the Learning Hall in time; however, the Doctor states that they can cross through the Wasteland. Selris is reluctant but soon relents.


===Episode Two===
Thara and his gang vandalise the Kroton teaching machines to force them to emerge. They are stopped by a bellowing, mechanical voice ordering them to leave the hall immediately. Thara wants to push on to bring the Krotons out. The Doctor, Selris and everyone else arrive and unarm the vandals and reason with them.
The device stops when the Doctor shields his face.  Zoë notes that the device must utilize pattern recognition, which is confirmed when the Doctor inadvertently lowers his hands causing it to come back to life. A student attacks the device, which vaporizes him and then retracts back into the Kroton machine.  The Doctor notes the apparently limited logic of the device's programming; it appeared to think it had completed its task of destroying him.  The bellowing mechanical voice returns, ordering them to leave the hall. They obey.


The Doctor and Zoë note the large gaps in the Gonds' knowledge; the Krotons apparently are training the Gonds for a specific purpose. They leave Jamie to care for Vana and enter the Learning Hall to investigate the teaching machines for themselves. On the way, the Doctor investigates a closed-off chamber running under the Kroton machine, and that the machine's foundation resembles a root structure - could the Kroton machine be organic?  When he returns, he is horrified to see Zoë operating a learning machine. She earns a score twice as high as any Gond, much to Selris's amazement, and is almost immediately summoned to be a Kroton companion. The Doctor takes the test himself; not performing as well as Zoë (scoring higher but requiring more questions) but nonetheless well enough to also be promptly selected.
Somewhere inside the machine, a check is run on the Doctor. In the Learning Hall a portal opens and a metallic, snake-like object emerges and moves towards the group. Inside the machine all screens display an image of the Doctor. The probe homes in on the Doctor who backs away. The Doctor falls and covers his face as the machine bears in...


They enter the Kroton machine and find the interior chamber empty, save for two chairs. They sit and are subjected to a force device which activates a pair of tanks filled with a crystalline slurry. Zoë notes that the device converts mental power into energy. They see the tanks and realize that whereas the Gonds' mental energy was insufficient, their mental energy triggered the tanks into operation. Two Krotons, crystalline bipeds, are formed out of the slurry and awaken.
=== Episode two ===
[[File:SecondOnScreen.jpg|thumb|right|The Krotons take notice of the Doctor.]]
The device stops when the Doctor shields his face. Zoe notes that the device must use pattern recognition. This is confirmed when the Doctor deliberately lowers his hands momentarily and it comes back to life. A student attacks the device, which vaporises him and then retracts into the Kroton machine. The Doctor notes the apparently limited logic of the device's programming; it seems to think it has completed its task of destroying him. Thara wants to continue destroying the machines, but Selris stops him. The bellowing mechanical voice returns, ordering them to leave the hall. Selris orders the Gonds back.


The Doctor and Zoë escape from the Machine's rear exit, eluding the blasters, while Jamie breaks in through the front. The Krotons note that the Doctor and Zoë are not Gonds, and resolve to recapture them. Jamie, who the Krotons believe to be a Gond, is captured and subjected to the mental probe. They note that he is not a 'high-brain;' consequently the power of the mental probe will destroy him.
The Doctor checks up on Vana. She is getting better. The Doctor and Zoe note the large gaps in the Gonds' knowledge. They have a great knowledge of [[chemistry]] and [[medicine]] but no knowledge of [[electricity]]. The Krotons apparently are training the Gonds for a specific purpose. They leave Jamie to care for Vana and go look round the Learning Hall. Selris says he will come with them.


===Episode Three===
The Doctor, Zoe and Selris enter the Learning Hall. The Doctor investigates a closed-off chamber running under the Kroton machine, and he and Selris go to investigate. Left alone, Zoe's curiosity forces her to experiment with the learning machines. She becomes enthralled as she operates it. The Doctor and Selris come back, saying it is only the foundations of the machine; however, the Doctor has noticed something is peculiar. Before he has a chance to explain, he notices Zoe on the machine and pulls her off it and berates her. Zoe has a big smile on her face and says that the Krotons are happy with her. The Doctor tries to snap her out of this brainwashed state. Selris notices that she has registered twice as high as the record for a Gond score.
One of the Krotons determines that Jamie may be able to provide information about the Doctor and Zoë, and ceases the mind probe. They track the Doctor and Zoë as they head toward the TARDIS, and interrogate Jamie as he awakens, learning that they are travelers in space and time.


A group of Gonds, led by Security chief [[Eelek]], approaches scientist Beta about how to attack the Krotons, now that the Doctor and Zoë are presumed dead. Beta is reluctant, not out of fear as Eelek infers, but out of a lack of knowledge. The Krotons have only taught the Gonds what they intend for them to know, and Beta bemoans the inability of the Gonds to think for themselves.  Eelek is impatient to act against the Krotons; additionally he covets Selris's position for himself.
Vana wakes up. She begins to babble about a "burning ball". Thara tries to calm her, but she continues to talk about "flashing lights" and her "burning mind". She briefly recognises Thara but then goes back into her reverie. Jamie gives her some pills the Doctor gave him which send her back to sleep. Jamie leaves to tell the Doctor of the situation.


A Kroton leaves the machine (which they call the [[Dynotrope]]) to destroy the TARDIS, intending to trap the Doctor and Zoë on the planet, while the other Kroton provides directional information to his otherwise blind companion.
The Doctor and Zoe are inspecting one of the walls in the Gond city and find it covered in some kind of crystalline substance. The Doctor states that underground he found that the machine's foundation had a root structure, suggesting the Kroton machine may be organic. A gong sounds, and a message from the Krotons is delivered. Zoe has been summoned to be a companion of the Krotons. The Doctor takes the test himself so as to accompany her. He does not perform as well as Zoe, scoring higher but requiring more questions. The Doctor comes away from the machine stating that he is happy he has pleased the Krotons, before realising he too is becoming brainwashed. The gong sounds again, and the Doctor has been summoned also. The door opens. The Doctor and Zoe have lost a bit of their bravery but edge their way in. As the door closes, Jamie enters and sees his two friends enter the dangerous machine.


Thara is also resentful at Selris's apparent inaction. Although Selris considers the Krotons to be enemies, he is more cautious about how to fight back than Eelek.  He doubts Eelek's intentions, seeing his ambition as more of a power grab.  At the council meeting, he is alarmed to discover than in his absence they voted to elect Eelek as leader.  He reminds Eelek that they still have no more weapons to fight back with than they did when the Krotons first arrived, and the resulting wasteland is still desolate thousands of years later.
[[File:TwoZoeUnderKrotonInterrogation.jpg|thumb|left|Zoe and the Doctor inside the teaching machine.]]


Meanwhile the Doctor and Zoë have retrieved some items from the TARDIS, and collect sulfurous rocks from the Wasteland.  The Kroton captures them, but when Jamie attacks the other Kroton, it is disoriented and they escape. The other Kroton must ignore Jamie to provide directional data, and instructs the Kroton to destroy the TARDIS.  The Kroton fires a dispersion jet; Zoë is horrified when the mist clears and the TARDIS is gone, but shortly after the Kroton returns to the Dynotrope the TARDIS re-materializes. The Doctor had turned on the [[HADS]] (Hostile Action Displacement System) before leaving, and they return to the Gond city.
The Doctor and Zoe find the interior chamber empty, save for two chairs. They sit and are subjected to a force generator that keeps them glued to the spot. The Doctor asks Zoe to hold onto the other end of a chain which may equalise the power load and save them. The machine lights up and bears down on them.


Eelek and his men prepare to attack the Dynotrope directly, a plan Selris and Beta dismiss as suicide.  Selris has his own plan, which he shares with Beta, to attack the support pillars under the Dynotrope (accessible via the closed chamber in the Learning Hall). He hopes the attack will force the Krotons to emerge so they can be attacked directly.
Jamie is furious with Selris for allowing the Doctor and Zoe to enter the machine. He tries to get in.


The Doctor and Zoë return to find Thara with the recovered Vana, preparing to leave the evacuated city. The Doctor is alarmed when Thara informs him of Selris's plan, and he hurries off to the learning hall, stopping off at Beta's lab to leave the sulfur and some instructions for him to follow. His alarm heightens when he realizes Jamie may still be in the Dynotrope. The Doctor enters the underchamber yelling for them to stop, as their efforts cause a massive rockfall.
The Doctor and Zoe struggle against the machine. They succeed and awake. Zoe notes that the device must convert mental power into energy. They see some bubbling tanks and realise that, whereas the Gonds' mental energy was insufficient, their mental energy set the tanks into operation. The Doctor takes a sample and realises that it is a crystalline slurry for making life. Zoe discovers some pipes on the floor, similar to an astronaut's airlines. They notice something forming in the tanks. As it starts to climb out, the Doctor and Zoe escape. As they do, two Krotons, crystalline bipeds, plug themselves into the airlines and watch them on their scanners.


===Episode Four===
Outside Jamie is still trying to get in. He moves off in search of a crowbar.
The Doctor is shaken but otherwise unhurt, though several Gonds are injured, including Thara.  The Krotons struggle to stabilize the Dynotrope, which is slightly damaged, while Jamie attempts to escape.  Vana provides the Doctor with a small sample of Beta's sulfuric acid.  The Doctor is horrified to learn that Jamie is indeed in the Dynotrope, though he manages to escape due to his own ingenuity to the Doctor and Zoë's delight. Jamie assists Beta with creating the sulfuric acid.


While Eelek and Selris argue over leadership a Kroton emerges from the Dynotrope, demanding that the two high-brains (The Doctor and Zoë) be returned.  Their minds are needed to produce the energy to repair the drive mechanism, and the Dynotrope is quickly running out of energy.  The opportunistic Eelek realizes that if they are captured, the Krotons will leave, though Selris suspects that the Krotons will destroy the Gonds regardless. Eelek and his men capture the Doctor and Zoë and force them into the Dynotrope.  Selris takes a bottle of Beta's acid and leaps through the closing hatchway, passing it to the Doctor before being blasted by a Kroton.
The Krotons wonder why the Doctor and Zoe are not following the same pattern as the other Gonds. They speculate as to whether the conditioning is failing.


The Doctor realizes that if the Dynotrope's energy exhausts, the resulting explosion will destroy the city as well.  While he stalls and distracts them, Zoë dumps the acid into the crystal slurry tank, fatally poisoning the Krotons.  Meanwhile, Beta and Jamie reach the clifftop and pour the vat of acid over the Dynotrope, causing it to dissolve. The Gonds rejoice at their freedom.  Thara intends to fill his father's hereditary post as leader in place of the disgraced Eelek. As Beta looks forward to learning more from the Doctor, however, he finds that the travelers have gone.
The Doctor and Zoe make their way through an elaborate series of pipes and find a photo-electronic circuit that should open the door, but it has been disabled. The Doctor uses a piece of metal he has with him to complete the circuit manually. They door opens, but they realise that they are on the cusp of where the deadly gas vaporises the Gonds.


==Cast==
The Krotons watch the reasoning of these Gonds in shock.
*[[Second Doctor|The Doctor]] - [[Patrick Troughton]]
*[[Jamie McCrimmon]] - [[Frazer Hines]]
*[[Zoe Heriot]] - [[Wendy Padbury]]
*[[Abu]] - [[Terence Brown]]
*[[Axus]] - [[Richard Ireson]]
*[[Beta (Gond)|Beta]] - [[James Cairncross]]
*[[Custodian (of the Learning Hall)|Custodian]] - [[Maurice Selwyn]]
*[[Eelek]] - [[Philip Madoc]]
*[[Kroton]] - [[Robert La'Bassiere]]
*[[Kroton]] - [[Miles Northover]]
*Kroton Voice - [[Roy Skelton]]
*Kroton Voice - [[Patrick Tull]]
*[[Selris]] - [[James Copeland]]
*Student - [[Bronson Shaw]]
*[[Thara]] - [[Gilbert Wynne]]
*[[Vana]] - [[Madeleine Mills]]


==Crew==
Zoe decides to risk it, but they should drop down the side of the ramp and escape that way. They do so.
*[[Assistant Floor Manager]] - [[David Tilley]]
*[[Costumes]] - [[Bobi Bartlett]]
*[[Designer]] - [[Raymond London]]
*[[Film Cameraman]] - [[Alan Jonas]]
*[[Film Editor]] - [[Martyn Day]]
*[[Make-Up]] - [[Sylvia James]]
*[[Producer]] - [[Peter Bryant]]
*[[Production Assistant]] - [[Edwina Verner]]
*[[Script Editor]] - [[Terrance Dicks]]
*[[Special Sounds]] - [[Brian Hodgson]]
*[[Studio Lighting]] - [[Howard King]]
*[[Studio Sound]] - [[John Holmes]]
*[[Theme Arrangement]] - [[Delia Derbyshire]]
*[[Title Music]] - [[Ron Grainer]]
*[[Visual Effects]] - [[Bill King]]


==References==
The Krotons decide to keep monitoring the Doctor and Zoe whilst also ordering the Gonds to bring them back. They speculate that they are not Gonds. They look in the Learning Hall and see Jamie attempting to enter. He is also not a Gond, but another Gond, Selris, is watching on. They speculate the Gonds are working in alliance with a new race. They decide to take Jamie.
* The Doctor sets the [[HADS]] ([[Hostile Action Displacement System]]) on the [[the Doctor's TARDIS|TARDIS]].
* Hydrogen Telluride is referred to as being the worst smell in the world.
* The Doctor flatly claims he isn't a doctor of medicine.


==Story notes==
The door opens. Jamie, armed with the crowbar, enters. He is immediately gripped by a Kroton. They test his mind. The machine starts, and Jamie is paralysed. He tries to resist. The Krotons realise he has a primitive brain. They state that the machine will destroy him if he does. Jamie slumps to the ground...
*A preliminary outline for the story, then entitled '''''The Trap''''',  was submitted for Season 2, but it was rejected because the robots were deemed too similar to the [[Mechanoid]]s, then set to feature in [[DW]]: ''[[The Chase]]''.   Three years later, Holmes re-submitted the outline as '''''The Space-Trap''''' to a more receptive new production team. The script — under the name '''''The Space Trap''''' — was actually commissioned for delivery in 1969, probably to be the penultimate story of Season 6. However, because Holmes had completed the scripts early, the story  could go into production in late 1968 when a [[Dick Sharples]] story, ''[[The Amazons]]'' (later known as ''The Prison in Space''), fell by the wayside.    
*All episodes of this serial exist in 35 mm telerecording negative
*This was repeated as part of ''The Five Faces of Doctor Who''.
*This is the first collaboration between writer [[Robert Holmes]] and [[script editor]] [[Terrance Dicks]]. It was only Dicks' second story in that capacity. In a neat bit of symmetry, ''[[Horror of Fang Rock]]'' was one of ''script editor'' Robert Holmes' '''last''' stories, written by Terrance Dicks.


===Ratings===
=== Episode three ===
*Episode 1 - 9.0 million viewers
[[File:JamieAttackedByKrotons.jpg|thumb|right|Jamie undergoes Kroton mind probe.]]
*Episode 2 - 8.4 million viewers
One of the Krotons determines that Jamie may be able to provide information about the Doctor and Zoe and turns off the mind probe.
*Episode 3 - 7.5 million viewers
*Episode 4 - 7.1 million viewers


===Myths===
The Doctor decides to head back to the TARDIS. Zoe questions the safety of Jamie, but the Doctor perseveres.
*The Krotons were the winning entry in a Blue Peter 'design a monster' competition. ''(One of the winning entries in a Blue Peter 'design a monster competition, the 'Aqua-Man', resembled a cardboard box with legs and arms - similar to the Krotons' appearance.)''


===Filming locations===
The Krotons question Jamie as to where he and his friends come from. They ask about the TARDIS, and Jamie is forced to answer truthfully by the mind probe. They watch as the Doctor and Zoe enter the TARDIS. Jamie questions if they are heading off without him. The Krotons deliberate whether to destroy the TARDIS.
*West of England Quarry and the Tank Quarry in Malvern, Worcestershire
*[[Ealing Television Film Studios]], Ealing Green, Ealing
*[[Lime Grove Studio D|Lime Grove Studios (Studio D)]], Lime Grove, London


===Production errors===
A group of Gonds, led by security chief Eelek, approaches scientist Beta about how to attack the Krotons now that the Doctor and Zoe are presumed dead. Beta is reluctant, not out of fear as Eelek infers, but out of a lack of knowledge. The Krotons have taught the Gonds only what they want for them to know. Beta bemoans the inability of the Gonds to think for themselves and thinks they are just as unprepared and primitive as their ancestors. Eelek is impatient to act against the Krotons. He reveals there has been a vote amongst the counsel of the Gonds and that he has been announced the new leader.
{{discontinuity}}
 
*Beta is simultaneously in his lab AND underneath the Learning Hall at the end of Episode 3.
They decide not to fire. They question Jamie about the operating principle and the transference interval of the TARDIS, but Jamie cannot answer any of those questions. A Kroton is sent out to investigate.
*Jamie collides with Zoe whilst climbing in Episode 1, and in the same scene her knickers are briefly visible.
 
Back in the Gond city, Thara tends Vana. Selris comes and tells of the fact that the Doctor, Zoe and Jamie have entered the machine and that he is going to call a counsel meeting to discuss what to do. Thara is resentful of Selris's apparent inaction and tells him of Eelek's power grab.
 
The remaining Kroton tells Jamie he is to be killed.
 
Thara tells Selris that the Gonds are fed up with talking and want war. Although Selris considers the Krotons enemies, he is more cautious about how to fight back than Eelek. He doubts Eelek's intentions and sees his ambition as more of a power grab.
 
Jamie questions what the Doctor and Zoe are needed for. The Kroton explains that high ability brains are needed for transferring power into the [[Dynatrope]], the Kroton's name for their machine.
 
At the council meeting, Beta openly argues with Eelek.
 
The Kroton tells Jamie that there is no way of destroying a Kroton. They can be rendered into molecular form but will always survive. Jamie is edging towards a weapon that he saw the other Kroton arm himself with.
 
Meanwhile the Doctor and Zoe have analysed the substance that they found in the tank and have discovered that it is [[tellurium]]. They have also discovered that the smell in the air is [[hydrogen]] telluride. The Doctor wants to extract some of the sulphurous rock that is producing this gas. Zoe fears they are being watched. They are, by a Kroton. Jamie watches on the screen and implores the Doctor and Zoe to get back in the TARDIS.
 
Zoe sees the Kroton, and it orders them to return to the Dynatrope. Jamie attacks the other Kroton; it is disorientated.
 
The Kroton is unable to see in the light and has lost contact with the other Kroton; the Doctor and Zoe are able to escape. The other Kroton must ignore Jamie to provide directional data and instructs the Kroton to destroy the TARDIS. The Kroton fires a dispersion jet. Zoe is horrified when the mist clears and the TARDIS is gone, but soon after the Kroton leaves to return to the Dynatrope, the TARDIS re-materialises. The Doctor tells Zoe he turned on the HADS ([[Hostile Action Displacement System]]) before leaving, and they return to the Gond city.
 
Eelek and his men prepare to attack the Dynatrope directly. Selris enters and demands Eelek stop. Eelek ignores him and leaves with his supporters. Selris has his own plan, which he shares with Beta, to attack the support pillars under the Dynatrope (accessible via the closed chamber in the Learning Hall). He hopes the attack will force the Krotons to emerge so they can be attacked directly.
 
The Kroton tells Jamie that, without high ability brain power, the Dynatrope will expire in three hours. Jamie escapes.
 
The Doctor and Zoe return to find Thara with the recovered Vana, preparing to leave the evacuated city. The Doctor is alarmed when Thara informs him of Selris's plan. He hurries off to the learning hall. Selris is putting his plan into operation.
 
The Doctor stops off at Beta's lab to leave the sulphur and instructions. His alarm heightens when he realises Jamie may still be in the Dynatrope. The Doctor and Zoe rush off, but Thara and Vana stay with Beta.
 
The Krotons notice that their Dynatrope is unbalancing.
 
Selris watches as cracks begin to form in the roof of the base unit of the Dynatrope. The Doctor enters the underchamber, yelling for them to stop. Their efforts cause a massive rockfall. Some of the rubble falls on the Doctor...
 
=== Episode four ===
Thara and Vana head down to the foundations of the Dynatrope. They feel the rumbling. Thara rushes down.
 
Thara joins Zoe and tries to save her, but she refuses to leave without the Doctor. Thara sets off to look for him.
 
Vana finds Selris and tells him that Thara is looking for the Doctor and Zoe. Selris worries for the Doctor.
 
The Doctor is shaken but otherwise unhurt, though several Gonds are injured. Thara is added to the number of injured when a further rock fall lands on his leg. The Doctor and Zoe pull the rock off.
 
Jamie staggers around the tremulous Dynatrope looking for an exit.
 
The Krotons are attempting to readjust their Dynatrope, eventually rendering it stable. They realise that the Gonds have attacked them in association with the Doctor and Zoe. They send out to get them back.
 
Thara has fractured his leg. The Doctor wants to abandon the Learning Hall. Selris joins them and regrets that his actions have not effected the machine at all. The Doctor disagrees and shows that it is leaking and probably not running at full power. Vana provides the Doctor with a small sample of Beta's [[sulphuric acid]]. The Doctor is horrified to learn that Jamie is inside the Dynatrope and rushes off.
 
[[File:DocZoeWorkOutKrotonMystery.jpg|left|thumb|The Doctor and Zoe come up with a chemical plan.]]
 
In an effort to escape, Jamie tries to pull the door open but then finds the metal the Doctor used.
 
Eelek and Selris argue over leadership. Eelek blocks all of Selris' ideas and is preparing for war. He attempts to arrest Selris, but all are distracted when a Kroton emerges from the Dynatrope, demanding the two high-brains (the Doctor and Zoe) be returned. Their minds are needed to produce energy to repair the drive mechanism, and the Dynatrope is quickly running out of energy. The Kroton kills a Gond and says they have fifteen minutes. Eelek promises that they will comply.
 
Through trial and error, Jamie manages to open the door a crack
 
Eelek and Selris argue. The opportunistic Eelek realises that if they are captured, the Krotons will leave, though Selris suspects that the Krotons will destroy the Gonds regardless.
 
The Doctor and Zoe discover Jamie stuck in the door and pull him out, narrowly avoiding the gas. The Doctor checks Jamie is okay and sends him off to Beta to prepare more acid before rushing off.
 
Vana and Selris decide that what Eelek is doing is unfair and that the Doctor and Zoe should be warned. Jamie aids Beta in the construction of the acid — although neither really know what they are doing.
 
Vana and Selris come up with a plan. Selris is to distract the guards, whilst Vana escapes and warns their friends. This plan is foiled, and as Vana is brought back, the bottle of acid falls from her. Selris picks it up.
 
The Dynatrope will power down in 27 minutes. Eelek and his men capture the Doctor and Zoe as they enter the city. The Krotons watch this. They now have 22 minutes.
 
As they are forced into the machine, the Doctor tries to reclaim the acid from Vana, but she no longer has it. The Krotons decide not to destroy the Gonds yet as it will use up power.
 
Vana asks Selris if he has seen the acid. Selris realises what has happened and jumps into the Dynatrope as the door closes.
 
The Doctor and Zoe come face to face with the Krotons. As Selris appears and gives the acid to the Doctor, he is destroyed by a Kroton. The Krotons begin their take-off. They have twelve minutes. Zoe suggests they should stall for time, but the Doctor points out that if the machine powers down it will explode and destroy the planet. The Doctor manages to get the Krotons to explain that they need four brains working in tandem to power the ship. There used to be four Krotons, but two got destroyed in a space battle. This forced them to land on the planet of the Gonds and go into perpetual stability whilst they train the Gonds to assist them. During this story the Doctor surreptitiously hands the acid over to Zoe. There are now nine minutes.
 
Jamie and Beta make their way down into the basement of the Learning Hall carrying a huge cauldron of acid. Eelek tells him that the Doctor and Zoe have re-entered the machine. Jamie confronts Eelek for forcing them into it. The Gonds are evacuating the city as it will be destroyed when the Dynatrope leaves. Jamie, Beta, Vana and Thara stay.
 
The Krotons order the Doctor and Zoe to put headsets on as there are only six minutes left. As the Doctor distracts the Krotons, Zoe pours the acid into the tank into which their airlines are connected. The Doctor and Zoe stall for time but are eventually left with no option other than to put the headsets on. Just at the last minute, the Krotons begin to feel the effect of the acid. They fire their weapons, forcing the Doctor and Zoe to duck. When they emerge, they see the Krotons are dissolving. The Dynatrope also seems to be disintegrating.
 
Jamie, Beta and some more Gonds are pouring acid into the Dynatrope. They are joined by the Doctor and Zoe. They watch as the machine melts. The Doctor, Zoe and Jamie sneak away. Thara vows he will deal with Eelek, and Beta says he will become the true scientist he wishes he could be. He is only disappointed when he realises the Doctor isn't around to aid him.
 
In the Wasteland, the TARDIS dematerialises.
 
== Cast ==
* [[Second Doctor|Dr. Who]] - [[Patrick Troughton]]
* [[Jamie McCrimmon|Jamie]] - [[Frazer Hines]]
* [[Zoe Heriot|Zoe]] - [[Wendy Padbury]]
* [[Selris]] - [[James Copeland]]
* [[Abu]] - [[Terence Brown]]
* [[Vana]] - [[Madeleine Mills]]
* [[Thara]] - [[Gilbert Wynne]]
* [[Eelek]] - [[Philip Madoc]]
* [[Axus]] - [[Richard Ireson]]
* [[Beta (The Krotons)|Beta]] - [[James Cairncross]]
* [[Student (The Krotons)|Student]] - [[Bronson Shaw]]
* [[Custodian (The Krotons)|Custodian]] - [[Maurice Selwyn]]
* [[Kroton (species)|Kroton]] Voices - [[Roy Skelton]], [[Patrick Tull]]
* Krotons - [[Robert La'Bassiere]], [[Miles Northover]]
 
=== Uncredited cast ===
* Gonds - [[Robin Scott]], [[Peter Rann]], [[David Melbourne]], [[Nick Rutter]], [[Robert Hayward]], [[Mark Johnson]], [[Reg Nardi]], [[Keith Ashton]], [[Ronnie Chance]], [[Roger Charles]], [[Alex Hood]], [[Justine Elliott]], [[Pat Matthews|Patricia Matthews]], [[Wendy Wilson]], [[Sylvia Steele]] (all [[DWM 318]])
 
== Crew ==
* [[Writer]] - [[Robert Holmes]]
* [[Doctor Who theme|Title Music]] - [[Ron Grainer]] and the [[BBC Radiophonic Workshop]]
* [[Costumes]] - [[Bobi Bartlett]]
* [[Script Editor]] - [[Terrance Dicks]]
* [[Designer (crew)|Designer]] - [[Raymond London]]
* [[Producer]] - [[Peter Bryant]]
* [[Director (crew)|Director]] - [[David Maloney]]
* [[Special Sounds]] - [[Brian Hodgson]], [[BBC Radiophonic Workshop]]
* [[Special Effects]] designed by [[Bill King]] ([[Trading Post]])
* [[Make-Up]] - [[Sylvia James]]
* [[Studio Lighting|Lighting]] - [[Howard King|Howard T. King]]
* [[Studio Sound|Sound]] - [[John Holmes (sound designer)|John Holmes]]
* [[Film Cameraman]] - [[Alan Jonas]]
* [[Film Editor]] - [[Martyn Day]]
 
=== Uncredited crew ===
* [[Grams operator|Grams Operator]] - [[Ron Arnett]] ([[INFO]]: ''The Krotons'')
* [[Floor assistant|Floor Assistants]] - [[David Collins]], [[Maurice Gallagher]] ([[INFO]]: ''The Krotons'')
* [[Scene supervisor|Scene Supervisors]] - [[Ron Bailey (scene supervisor)|Ron Bailey]], [[Reg Lewis]], [[Brian Davis]], [[Ron Hasler]] ([[INFO]]: ''The Krotons'')
* [[Props]] - [[Sheila Bray]], [[Joe Hughes]] ([[INFO]]: ''The Krotons'')
* [[Graphics]] - [[Peter Netley]], [[Don Shaw]] ([[INFO]]: ''The Krotons'')
* [[Technical manager|Technical Manager]] - [[Fred Wright]] ([[INFO]]: ''The Krotons'')
* [[Director's assistant|Director's Assistant]] - [[Raquel Ebbutt]] ([[INFO]]: ''The Krotons'')
* [[Artists' booker|Artists's Booker]] - [[Barbara Buchanan]] ([[INFO]]: ''The Krotons'')
* [[Vision Mixer]] - [[David Langford]] ([[INFO]]: ''The Krotons'')
* [[Design assistant|Design Assistant]] - [[Jane Anderson]] ([[INFO]]: ''The Krotons'')
* [[Film camera assistant|Film Camera Assistant]] - [[John Walker]] ([[INFO]]: ''The Krotons'')
* [[Film sound|Film Sound]] - [[Ron Blight]] ([[INFO]]: ''The Krotons'')
* [[Film sound assistant|Film Sound Assistant]] - [[Ian Morton]] ([[INFO]]: ''The Krotons'')
 
== Worldbuilding ==
=== Science ===
* [[Hydrogen telluride]] is referred to as being the worst smell in the world.
 
== Story notes ==
* A preliminary outline for the story, then entitled ''The Trap'', was submitted for [[Season 2 (Doctor Who 1963)|season 2]]. It was rejected because the robots were deemed too similar to the [[Mechanoid]]s, then set to feature in ''[[The Chase (TV story)|The Chase]]''. Three years later, Holmes re-submitted the outline as ''The Space-Trap'' to a new, more receptive production team. The script — under the name ''The Space Trap'' (without hyphen, as here) — was actually commissioned for delivery in 1969, probably for the penultimate story of Season 6. However, because Holmes had completed the scripts early, the story went into production in late 1968 when a [[Dick Sharples]] story, ''[[Prison in Space]]'', fell by the wayside.
* Episode one exists as a 35mm black-and-white film negative, while the others exist as 16mm film negatives<ref>[http://archive.totterslane.co.uk/quick/s6.htm Quick Archive]</ref>.
* As of today, this story has the most [https://allthetropes.fandom.com/wiki/Title_Drop title-drops] of any ''[[Doctor Who]]'' story, at [[72 (number)|72]].
* [[Robert La'Bassiere]] — billed as playing one of the Krotons in the closing credits for episodes two to four — was actually a pseudonym for Robert Grant, who had requested that he be credited under this name both on-screen and in the ''[[Radio Times]]'' programme listings.
* This is the first collaboration between writer [[Robert Holmes]] and [[script editor]] [[Terrance Dicks]]. It was only Dicks's second story in that capacity. In a neat bit of symmetry, ''[[Horror of Fang Rock (TV story)|Horror of Fang Rock]]'' was one of ''script editor'' Robert Holmes's last stories, written by Terrance Dicks.
* [[David Maloney]] called the story "a disaster" and felt it was his fault, while [[Frazer Hines]] didn't care for it either, calling it "horrible". [[Terrance Dicks]] felt that it worked as a story, but not as a monster, feeling the Krotons themselves were useless and non-threatening.
* The Krotons were written with the intent of replacing the [[Dalek]]s as the Doctor's principle nemesis, as [[Terry Nation]] had asked The BBC to stop using them so that he could pitch his own Dalek series to US TV networks, which ultimately fell through. Unfortunately, the Krotons didn't have the same impact the Daleks had, and they faded into obscurity, with Nation eventually allowing the Daleks to return to this series midway through the [[Third Doctor]]'s era.
* [[Frazer Hines]] would have originally departed in this story (or at least, the one that filled its slot) and been replaced with a male companion named Nik. He ultimately decided to leave along with [[Patrick Troughton]].
* ''The Krotons'' was repeated on BBC2 in November [[1981]] to celebrate ''[[The Five Faces of Doctor Who]]'' and bridge the gap between [[Season 18 (Doctor Who 1963)|Seasons 18]] and [[Season 19 (Doctor Who 1963)|19]]. At the time, it was the only four-part Second Doctor serial that fully existed in the BBC Archives. All other four-part stories were either incomplete or missing entirely.
* [[Robert Holmes]] envisioned the Krotons as crystalline men. Costume designer [[Bobi Bartlett]] opted instead for a more robotic approach.
* Jack Lovell Ltd were tasked with constructing the Krotons but, in their haste to build the monsters, they did so to the wrong scale. As a result, the Krotons were larger and more unwieldy than intended and a rubber skirt had to be added to hide the operator's legs, which would otherwise now be exposed.
* Eelek was originally called Avrik, while the Dynotrope was originally named the Dynotron.
* [[Wendy Padbury]] found her PVC dress to be very impractical, because it was so prone to getting torn.
 
=== Ratings ===
* Episode one - 9.0 million viewers
* Episode two - 8.4 million viewers
* Episode three - 7.5 million viewers
* Episode four - 7.1 million viewers


==Continuity==
=== Myths ===
[[Image:DocHypnotizesVana2.jpg|thumb|right|Is this act of hypnotism a sign of psychic times to come?]]
* The Krotons were the winning entry in a Blue Peter "design a monster" competition. ''(One of the winning entries in a Blue Peter design a monster competition, the "Aqua-Man", resembled a cardboard box with legs and arms — similar to the Krotons' appearance.)''
* When the Doctor hypnotizes [[Vana]] he at first uses a stopwatch, much as his [[Third Doctor|third]], [[Fourth Doctor|fourth]] and [[Sixth Doctor|sixth]] selves would later do.  However in the later moments of the process, seen at right, he appears to use his hands in a "significant" manner. It is possible to interpret this last stage of the hypnosis process as the Doctor giving the process an extra psychic "nudge". 
::''It might be a limited form of the more extensive "mind-meld" heavily used by the [[Tenth Doctor]].''
 
* The [[Kroton]]s appear in [[EDA]]: ''[[Alien Bodies]]'' which greatly fleshes out Kroton history, biology and origins.  They also return to battle the [[Sixth Doctor]] and [[Charley Pollard]] in [[BFA]]: ''[[Return of the Krotons]]''.  Further examination of the [[Gond]] has, as of [[2010]] not been undertaken in any medium.


* The [[Second Doctor]]'s affinity for umbrellas in this story prefigures the [[Seventh Doctor]]'s obsession with them.  Indeed, the umbrella in this story is key to saving the Doctor and Vana's lives, perhaps suggesting why the Seventh Doctor seemed to find them so useful.
=== Filming locations ===
* West of England Quarry, Malvern, Worcestershire (Kroton searching in person and finds TARDIS)
* Tank Quarry, Malvern, Worcestershire (TARDIS lands / Doctor explores landscape)
* [[Ealing Television Film Studios]], Ealing Green, Ealing
* [[Lime Grove Studios|Lime Grove Studios (Studio D)]], Lime Grove, London


==Timeline==
=== Production errors ===
*This story occurs after [[ST]]: ''[[The Avant Guardian]]''
{{discontinuity}}
*This story occurs before [[DWM]]: ''[[Land of the Blind]]''
* Beta is simultaneously in his lab ''and'' underneath the Learning Hall at the end of episode three.
* In the opening shot of the story, the sliding hatch that opens to allow Selris to receive instructions from within clearly gets stuck before being jerked free from behind the scenes.
* The rock the Doctor places on the outer door of the machine falls straight down in close shot but is nowhere to be seen in long shot right afterwards.
* The lines spoken by the Krotons at the end of episode two are not exactly the same as those spoken at the beginning of episode three.
* Richard Ireson (Axus) trips up on one of his lines in episode four, saying "if we don't hand over the strangers, they'll kill us any anyway". Who will do the killing — the strangers or the Krotons?
* After the Doctor drops one of the Krotons' headsets in episode four, he is then shown properly placing it on his head. However, when the camera cuts to a shot of a Kroton and then back to the Doctor, the headset is off his head again without explanation.


==Home video and audio releases==
== Continuity ==
*Released on video as "The Krotons" in episodic format in 1991.
[[File:DocHypnotizesVana2.jpg|thumb|right|Is this act of hypnotism a sign of psychic times to come?]]
* The [[Kroton (species)|Krotons]] appear in [[PROSE]]: ''[[Alien Bodies (novel)|Alien Bodies]]'', which greatly fleshes out Kroton history, biology and origins. They also return to battle the [[Sixth Doctor]] and [[Charley Pollard]] in [[AUDIO]]: ''[[Return of the Krotons (audio story)|Return of the Krotons]]''.
* The [[Eleventh Doctor]] sets up the HADS before his encounter with the [[Ice Warrior]] [[Skaldak]]. ([[TV]]: ''[[Cold War (TV story)|Cold War]]'')


==Novelisation and its audiobook==
== Home video and audio releases ==
[[Image:Krotons novel.jpg|right|75px]]
=== DVD releases ===
: ''Main article: [[The Krotons (novelisation)]]''
This story was released on DVD in the [[UK]] on [[2 July (releases)|2 July]] [[2012 (releases)|2012]]. The DVD extras include:
* Commentary with actors [[Philip Madoc]] ([[Eelek]]), [[Richard Ireson]] ([[Axus]]) and [[Gilbert Wynne]] ([[Thara]]), assistant floor manager [[David Tilley]], make-up designer [[Sylvia James]], costume designer [[Bobi Bartlett]] and special sounds designer [[Brian Hodgson]]. Moderated by [[Toby Hadoke]]
* ''[[Second Time Around: The Troughton Years (documentary)|Second Time Around]]'' - Looking back over [[Patrick Troughton]]'s tenure as the [[Second Doctor]]
* ''[[Doctor Who Stories: Frazer Hines (documentary)|Doctor Who Stories - Frazer Hines (Part One)]]'' - Actor [[Frazer Hines]] reminisces about his time on the series in an interview originally recorded in 2003 for the BBC's ''[[The Story of Doctor Who|Story of Doctor Who]]''
* ''[[The Doctor's Strange Love: The Krotons (documentary)|The Doctor's Strange Love]]'' - Writers [[Joseph Lidster]] and [[Simon Guerrier]] take an affectionate look at ''The Krotons''
* ''[[Radio Times]]'' Listings (DVD-ROM)
* Production Information Subtitles
* Photo Gallery
* Coming Soon Trailer - ''[[The Greatest Show in the Galaxy (TV story)|The Greatest Show in the Galaxy]]''


*Novelised as ''[[The Krotons (novelisation)|The Krotons]]'' by [[Terrance Dicks]] published in June [[1985]].
* Editing for the DVD release was completed by the [[Doctor Who Restoration Team]].
*The Doctor's claim that he is "not a doctor of medicine" is repeated, followed by the omniscient narrator describing this reply "a little unfair[...], since he was in fact a doctor of almost everything."
<gallery position="center" captionalign="center" hideaddbutton="true">
File:TheKrotonsrDVDregion2.jpg|Region 2 DVD cover
File:The krotons.jpg|Region 1 DVD cover
File:Krotons australia dvd.jpg|Region 4 DVD cover
</gallery>


==External links==
=== Digital releases ===
*{{bbcepguideclassic|krotons/|The Krotons}}
This story is available:
*{{dwrefguide|who_2w.htm|The Krotons}}
* in [[iTunes]] stores ([[Australia]], [[Canada]], [[France]], [[Germany]], [[UK]] and [[US]]) as part of the ''Doctor Who: The Classic Series'' collection ''Doctor Who: The Best of The Second Doctor'', which additionally includes the stories ''[[The Tomb of the Cybermen (TV story)|The Tomb of the Cybermen]]'', ''[[The Ice Warriors (TV story)|The Ice Warriors]]'' and ''[[The Seeds of Death (TV story)|The Seeds of Death]]'';
*{{briefhistory|serials/ww.html|The Krotons}}
* in non-continental iTunes stores (Australia, Canada, UK and US) as a stand-alone season of ''Doctor Who: The Classic Series'';
*{{locguide|krotons|Krotons}}
* on [[Amazon (service)|Amazon Video]] (UK) as Season 47 of ''Doctor Who (Classic)'' series;
* for streaming through [[BritBox]] (US) as part of Season 6 of ''Classic Doctor Who''. 
<gallery position="center" captionalign="center" hideaddbutton="true">
Krotons.jpg|''The Krotons'' iTunes cover
SecondDoctorBest.jpg|''Best of Second Doctor'' collection iTunes cover
</gallery>


{{season 6}}
=== VHS releases ===
* This story was released on video as ''The Krotons'' in episodic format in 1991.
<gallery position="center" captionalign="center" hideaddbutton="true">
The Krotonsvhs.jpg|AUS VHS Cover
Bbcvideo-770-us.jpg|US VHS Cover
Bbcvideo-770-uk.jpg|UK VHS Cover
The Krotonsaudio.jpg|CD release
</gallery>


{{wikipedia|The_Krotons}}
== Footnotes ==
{{reflist}}
== External links ==
* {{bbcepguideclassic|krotons/|The Krotons}}
* {{radiotimes|2009-08-20/the-krotons|The Krotons}}
{{dwcast}}
{{dwrefguide|who_2w.htm|The Krotons}}
* {{briefhistory|serials/ww.html|The Krotons}}
* {{locguide|krotons|Krotons}}
{{DWTV}}
{{TitleSort}}
[[es:The Krotons]]
[[fr:The Krotons]]
[[ru:Кротоны (ТВ история)]]


{{DEFAULTSORT:Krotons}}
[[Category:Articles that were originally Wikipedia forks]]
[[Category:Second Doctor episodes|Krotons]]
[[Category:Doctor Who (1963) television stories]]
[[Category:1968 television stories|Krotons]]
[[Category:1968 television stories]]
[[Category:1969 television stories|Krotons]]
[[Category:1969 television stories]]
[[Category:Season 6 stories]]
[[Category:Season 6 stories]]
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[[Category:Four part serials]]
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[[Category:Kroton stories]]

Latest revision as of 20:03, 3 November 2024

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The Krotons was the fourth serial of season 6 of Doctor Who. It was the first story penned by future script editor Robert Holmes, whose prolific contributions to the series created or contributed to many key elements of the programme's mythology.

Synopsis[[edit] | [edit source]]

The TARDIS arrives on the planet of the Gonds, who are ruled and taught in a form of self-perpetuating slavery by the alien Krotons — crystalline beings whose ship, the Dynatrope, crash-landed there thousands of years earlier after being damaged in a space battle.

The Krotons are in suspended animation, in a crystalline slurry form, awaiting a time when they can be reconstituted by absorption of mental energy. Periodically, the two most brilliant Gond students are received into the Dynatrope, nominally to become "companions of the Krotons", but in truth to have their mental energy drained, after which they are killed.

When the Second Doctor and Zoe take the students' test, their mental power is sufficient to reanimate the Krotons. The Doctor discovers that their life system is based on tellurium. With help from the Gond scientist Beta, he destroys them and their ship with an impure form of sulphuric acid.

Plot[[edit] | [edit source]]

Episode one[[edit] | [edit source]]

On the planet of the Gonds, a ceremony is underway. The two brightest students, Abu and Vana, have been selected to become "companions" of the Gonds' unseen masters, the Krotons. As Abu eagerly dons his selection robes and enters the Krotons' machine, another Gond, Thara desperately begs Vana not to go. The Gonds argue with him. She has been selected for the highest honour. Those companions who have gone before have never been seen nor heard from again. The Gond leader Selris, Thara's father, is resolute, stating that Kroton law dictates that she must.

The Doctor's TARDIS lands in a desolate area nearby. Jamie immediately notes the strong odour of sulphur whilst the Doctor states that the planet has twin suns. Zoe suggests that they depart, but the Doctor opts to explore. From a clifftop they see the Gond city below. They encounter a metallic crystalline structure with a hatchway similar to the one in the city. Jamie noticed that the smell is stronger. The Doctor is cautious. He identifies the structure as a machine and wants to head back to the TARDIS. As they head off, the door opens, and they hide as a dazed and weary Abu emerges from the hatchway. Before their horrified eyes, he is evaporated by blasts of energy.

Jamie and Zoe are less than impressed by the Doctor's sunny outlook for their landing spot.

Thara and Selris argue over Vana's selection. Thara questions if the Krotons even exist. Thara draws a weapon and is soon surrounded by Gonds. The Doctor, Jamie and Zoe enter the city. They are regarded with suspicion; the Gonds have never met strangers before and the area where they landed, the Wasteland, is believed uninhabitable. Meanwhile, the stand-off between Thara and the Gonds continues. Vana wants to go through the door in order to protect Thara. He relents. The Doctor, Jamie and Zoe watch this, and the Doctor tries to stop it, thinking it some kind of sacrifice. The Gonds seize the Doctor and his colleagues for stopping their ritual. As a particularly hotheaded young man named Axus fights with Jamie, Vana rushes into the Kroton machine. Jamie wins the fight with Axus. Selris interrogates the Doctor and his colleagues. The Doctor's description of the death of Abu shocks the crowd, as does the revelation that they have been in the Wasteland. The Doctor, Jamie and Zoe rush back to the Wasteland to rescue Vana, followed by Thara.

They all reach the door. The Doctor sets about finding stones and starts blocking the energy beams with rocks. They hide. Soon Vana appears and swoons. The Doctor swoops in with his umbrella up to save her. The gas knocks the stones free, which causes the Doctor's umbrella to disintegrate, but everyone is safe. Vana is near-catatonic. They all set off for Selris' house.

Back in the city, the Doctor tends to Vana through hypnosis. Selris tries to make sense of what is happening. Have they always been murdering the selected Gonds? The Kroton machine landed on the planet thousands of years earlier, and the ensuing war nearly annihilated the Gonds and ruined the landscape. Since then, the Krotons have never left their machine.

Thara and a band of students sneak into the Learning Hall and interrogate the Curator for information about the Krotons. The Curator states he is forbidden to tell and that they only communicate through messages and, very occasionally, voice. They decide to fetch the Krotons out by smashing their teaching machines.

The Doctor and his colleagues learn that the Krotons created the teaching machines to train the Gonds on the laws, science and culture that require their top students to become companions; the Doctor notes this is a form of self-perpetuating slavery. Selris panics about what this means for his society. Beta, their chief scientist, arrives and tells Selris of Thara's actions. Selris worries he will not reach the Learning Hall in time; however, the Doctor states that they can cross through the Wasteland. Selris is reluctant but soon relents.

Thara and his gang vandalise the Kroton teaching machines to force them to emerge. They are stopped by a bellowing, mechanical voice ordering them to leave the hall immediately. Thara wants to push on to bring the Krotons out. The Doctor, Selris and everyone else arrive and unarm the vandals and reason with them.

Somewhere inside the machine, a check is run on the Doctor. In the Learning Hall a portal opens and a metallic, snake-like object emerges and moves towards the group. Inside the machine all screens display an image of the Doctor. The probe homes in on the Doctor who backs away. The Doctor falls and covers his face as the machine bears in...

Episode two[[edit] | [edit source]]

The Krotons take notice of the Doctor.

The device stops when the Doctor shields his face. Zoe notes that the device must use pattern recognition. This is confirmed when the Doctor deliberately lowers his hands momentarily and it comes back to life. A student attacks the device, which vaporises him and then retracts into the Kroton machine. The Doctor notes the apparently limited logic of the device's programming; it seems to think it has completed its task of destroying him. Thara wants to continue destroying the machines, but Selris stops him. The bellowing mechanical voice returns, ordering them to leave the hall. Selris orders the Gonds back.

The Doctor checks up on Vana. She is getting better. The Doctor and Zoe note the large gaps in the Gonds' knowledge. They have a great knowledge of chemistry and medicine but no knowledge of electricity. The Krotons apparently are training the Gonds for a specific purpose. They leave Jamie to care for Vana and go look round the Learning Hall. Selris says he will come with them.

The Doctor, Zoe and Selris enter the Learning Hall. The Doctor investigates a closed-off chamber running under the Kroton machine, and he and Selris go to investigate. Left alone, Zoe's curiosity forces her to experiment with the learning machines. She becomes enthralled as she operates it. The Doctor and Selris come back, saying it is only the foundations of the machine; however, the Doctor has noticed something is peculiar. Before he has a chance to explain, he notices Zoe on the machine and pulls her off it and berates her. Zoe has a big smile on her face and says that the Krotons are happy with her. The Doctor tries to snap her out of this brainwashed state. Selris notices that she has registered twice as high as the record for a Gond score.

Vana wakes up. She begins to babble about a "burning ball". Thara tries to calm her, but she continues to talk about "flashing lights" and her "burning mind". She briefly recognises Thara but then goes back into her reverie. Jamie gives her some pills the Doctor gave him which send her back to sleep. Jamie leaves to tell the Doctor of the situation.

The Doctor and Zoe are inspecting one of the walls in the Gond city and find it covered in some kind of crystalline substance. The Doctor states that underground he found that the machine's foundation had a root structure, suggesting the Kroton machine may be organic. A gong sounds, and a message from the Krotons is delivered. Zoe has been summoned to be a companion of the Krotons. The Doctor takes the test himself so as to accompany her. He does not perform as well as Zoe, scoring higher but requiring more questions. The Doctor comes away from the machine stating that he is happy he has pleased the Krotons, before realising he too is becoming brainwashed. The gong sounds again, and the Doctor has been summoned also. The door opens. The Doctor and Zoe have lost a bit of their bravery but edge their way in. As the door closes, Jamie enters and sees his two friends enter the dangerous machine.

Zoe and the Doctor inside the teaching machine.

The Doctor and Zoe find the interior chamber empty, save for two chairs. They sit and are subjected to a force generator that keeps them glued to the spot. The Doctor asks Zoe to hold onto the other end of a chain which may equalise the power load and save them. The machine lights up and bears down on them.

Jamie is furious with Selris for allowing the Doctor and Zoe to enter the machine. He tries to get in.

The Doctor and Zoe struggle against the machine. They succeed and awake. Zoe notes that the device must convert mental power into energy. They see some bubbling tanks and realise that, whereas the Gonds' mental energy was insufficient, their mental energy set the tanks into operation. The Doctor takes a sample and realises that it is a crystalline slurry for making life. Zoe discovers some pipes on the floor, similar to an astronaut's airlines. They notice something forming in the tanks. As it starts to climb out, the Doctor and Zoe escape. As they do, two Krotons, crystalline bipeds, plug themselves into the airlines and watch them on their scanners.

Outside Jamie is still trying to get in. He moves off in search of a crowbar.

The Krotons wonder why the Doctor and Zoe are not following the same pattern as the other Gonds. They speculate as to whether the conditioning is failing.

The Doctor and Zoe make their way through an elaborate series of pipes and find a photo-electronic circuit that should open the door, but it has been disabled. The Doctor uses a piece of metal he has with him to complete the circuit manually. They door opens, but they realise that they are on the cusp of where the deadly gas vaporises the Gonds.

The Krotons watch the reasoning of these Gonds in shock.

Zoe decides to risk it, but they should drop down the side of the ramp and escape that way. They do so.

The Krotons decide to keep monitoring the Doctor and Zoe whilst also ordering the Gonds to bring them back. They speculate that they are not Gonds. They look in the Learning Hall and see Jamie attempting to enter. He is also not a Gond, but another Gond, Selris, is watching on. They speculate the Gonds are working in alliance with a new race. They decide to take Jamie.

The door opens. Jamie, armed with the crowbar, enters. He is immediately gripped by a Kroton. They test his mind. The machine starts, and Jamie is paralysed. He tries to resist. The Krotons realise he has a primitive brain. They state that the machine will destroy him if he does. Jamie slumps to the ground...

Episode three[[edit] | [edit source]]

Jamie undergoes Kroton mind probe.

One of the Krotons determines that Jamie may be able to provide information about the Doctor and Zoe and turns off the mind probe.

The Doctor decides to head back to the TARDIS. Zoe questions the safety of Jamie, but the Doctor perseveres.

The Krotons question Jamie as to where he and his friends come from. They ask about the TARDIS, and Jamie is forced to answer truthfully by the mind probe. They watch as the Doctor and Zoe enter the TARDIS. Jamie questions if they are heading off without him. The Krotons deliberate whether to destroy the TARDIS.

A group of Gonds, led by security chief Eelek, approaches scientist Beta about how to attack the Krotons now that the Doctor and Zoe are presumed dead. Beta is reluctant, not out of fear as Eelek infers, but out of a lack of knowledge. The Krotons have taught the Gonds only what they want for them to know. Beta bemoans the inability of the Gonds to think for themselves and thinks they are just as unprepared and primitive as their ancestors. Eelek is impatient to act against the Krotons. He reveals there has been a vote amongst the counsel of the Gonds and that he has been announced the new leader.

They decide not to fire. They question Jamie about the operating principle and the transference interval of the TARDIS, but Jamie cannot answer any of those questions. A Kroton is sent out to investigate.

Back in the Gond city, Thara tends Vana. Selris comes and tells of the fact that the Doctor, Zoe and Jamie have entered the machine and that he is going to call a counsel meeting to discuss what to do. Thara is resentful of Selris's apparent inaction and tells him of Eelek's power grab.

The remaining Kroton tells Jamie he is to be killed.

Thara tells Selris that the Gonds are fed up with talking and want war. Although Selris considers the Krotons enemies, he is more cautious about how to fight back than Eelek. He doubts Eelek's intentions and sees his ambition as more of a power grab.

Jamie questions what the Doctor and Zoe are needed for. The Kroton explains that high ability brains are needed for transferring power into the Dynatrope, the Kroton's name for their machine.

At the council meeting, Beta openly argues with Eelek.

The Kroton tells Jamie that there is no way of destroying a Kroton. They can be rendered into molecular form but will always survive. Jamie is edging towards a weapon that he saw the other Kroton arm himself with.

Meanwhile the Doctor and Zoe have analysed the substance that they found in the tank and have discovered that it is tellurium. They have also discovered that the smell in the air is hydrogen telluride. The Doctor wants to extract some of the sulphurous rock that is producing this gas. Zoe fears they are being watched. They are, by a Kroton. Jamie watches on the screen and implores the Doctor and Zoe to get back in the TARDIS.

Zoe sees the Kroton, and it orders them to return to the Dynatrope. Jamie attacks the other Kroton; it is disorientated.

The Kroton is unable to see in the light and has lost contact with the other Kroton; the Doctor and Zoe are able to escape. The other Kroton must ignore Jamie to provide directional data and instructs the Kroton to destroy the TARDIS. The Kroton fires a dispersion jet. Zoe is horrified when the mist clears and the TARDIS is gone, but soon after the Kroton leaves to return to the Dynatrope, the TARDIS re-materialises. The Doctor tells Zoe he turned on the HADS (Hostile Action Displacement System) before leaving, and they return to the Gond city.

Eelek and his men prepare to attack the Dynatrope directly. Selris enters and demands Eelek stop. Eelek ignores him and leaves with his supporters. Selris has his own plan, which he shares with Beta, to attack the support pillars under the Dynatrope (accessible via the closed chamber in the Learning Hall). He hopes the attack will force the Krotons to emerge so they can be attacked directly.

The Kroton tells Jamie that, without high ability brain power, the Dynatrope will expire in three hours. Jamie escapes.

The Doctor and Zoe return to find Thara with the recovered Vana, preparing to leave the evacuated city. The Doctor is alarmed when Thara informs him of Selris's plan. He hurries off to the learning hall. Selris is putting his plan into operation.

The Doctor stops off at Beta's lab to leave the sulphur and instructions. His alarm heightens when he realises Jamie may still be in the Dynatrope. The Doctor and Zoe rush off, but Thara and Vana stay with Beta.

The Krotons notice that their Dynatrope is unbalancing.

Selris watches as cracks begin to form in the roof of the base unit of the Dynatrope. The Doctor enters the underchamber, yelling for them to stop. Their efforts cause a massive rockfall. Some of the rubble falls on the Doctor...

Episode four[[edit] | [edit source]]

Thara and Vana head down to the foundations of the Dynatrope. They feel the rumbling. Thara rushes down.

Thara joins Zoe and tries to save her, but she refuses to leave without the Doctor. Thara sets off to look for him.

Vana finds Selris and tells him that Thara is looking for the Doctor and Zoe. Selris worries for the Doctor.

The Doctor is shaken but otherwise unhurt, though several Gonds are injured. Thara is added to the number of injured when a further rock fall lands on his leg. The Doctor and Zoe pull the rock off.

Jamie staggers around the tremulous Dynatrope looking for an exit.

The Krotons are attempting to readjust their Dynatrope, eventually rendering it stable. They realise that the Gonds have attacked them in association with the Doctor and Zoe. They send out to get them back.

Thara has fractured his leg. The Doctor wants to abandon the Learning Hall. Selris joins them and regrets that his actions have not effected the machine at all. The Doctor disagrees and shows that it is leaking and probably not running at full power. Vana provides the Doctor with a small sample of Beta's sulphuric acid. The Doctor is horrified to learn that Jamie is inside the Dynatrope and rushes off.

The Doctor and Zoe come up with a chemical plan.

In an effort to escape, Jamie tries to pull the door open but then finds the metal the Doctor used.

Eelek and Selris argue over leadership. Eelek blocks all of Selris' ideas and is preparing for war. He attempts to arrest Selris, but all are distracted when a Kroton emerges from the Dynatrope, demanding the two high-brains (the Doctor and Zoe) be returned. Their minds are needed to produce energy to repair the drive mechanism, and the Dynatrope is quickly running out of energy. The Kroton kills a Gond and says they have fifteen minutes. Eelek promises that they will comply.

Through trial and error, Jamie manages to open the door a crack

Eelek and Selris argue. The opportunistic Eelek realises that if they are captured, the Krotons will leave, though Selris suspects that the Krotons will destroy the Gonds regardless.

The Doctor and Zoe discover Jamie stuck in the door and pull him out, narrowly avoiding the gas. The Doctor checks Jamie is okay and sends him off to Beta to prepare more acid before rushing off.

Vana and Selris decide that what Eelek is doing is unfair and that the Doctor and Zoe should be warned. Jamie aids Beta in the construction of the acid — although neither really know what they are doing.

Vana and Selris come up with a plan. Selris is to distract the guards, whilst Vana escapes and warns their friends. This plan is foiled, and as Vana is brought back, the bottle of acid falls from her. Selris picks it up.

The Dynatrope will power down in 27 minutes. Eelek and his men capture the Doctor and Zoe as they enter the city. The Krotons watch this. They now have 22 minutes.

As they are forced into the machine, the Doctor tries to reclaim the acid from Vana, but she no longer has it. The Krotons decide not to destroy the Gonds yet as it will use up power.

Vana asks Selris if he has seen the acid. Selris realises what has happened and jumps into the Dynatrope as the door closes.

The Doctor and Zoe come face to face with the Krotons. As Selris appears and gives the acid to the Doctor, he is destroyed by a Kroton. The Krotons begin their take-off. They have twelve minutes. Zoe suggests they should stall for time, but the Doctor points out that if the machine powers down it will explode and destroy the planet. The Doctor manages to get the Krotons to explain that they need four brains working in tandem to power the ship. There used to be four Krotons, but two got destroyed in a space battle. This forced them to land on the planet of the Gonds and go into perpetual stability whilst they train the Gonds to assist them. During this story the Doctor surreptitiously hands the acid over to Zoe. There are now nine minutes.

Jamie and Beta make their way down into the basement of the Learning Hall carrying a huge cauldron of acid. Eelek tells him that the Doctor and Zoe have re-entered the machine. Jamie confronts Eelek for forcing them into it. The Gonds are evacuating the city as it will be destroyed when the Dynatrope leaves. Jamie, Beta, Vana and Thara stay.

The Krotons order the Doctor and Zoe to put headsets on as there are only six minutes left. As the Doctor distracts the Krotons, Zoe pours the acid into the tank into which their airlines are connected. The Doctor and Zoe stall for time but are eventually left with no option other than to put the headsets on. Just at the last minute, the Krotons begin to feel the effect of the acid. They fire their weapons, forcing the Doctor and Zoe to duck. When they emerge, they see the Krotons are dissolving. The Dynatrope also seems to be disintegrating.

Jamie, Beta and some more Gonds are pouring acid into the Dynatrope. They are joined by the Doctor and Zoe. They watch as the machine melts. The Doctor, Zoe and Jamie sneak away. Thara vows he will deal with Eelek, and Beta says he will become the true scientist he wishes he could be. He is only disappointed when he realises the Doctor isn't around to aid him.

In the Wasteland, the TARDIS dematerialises.

Cast[[edit] | [edit source]]

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

Crew[[edit] | [edit source]]

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

Worldbuilding[[edit] | [edit source]]

Science[[edit] | [edit source]]

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

  • A preliminary outline for the story, then entitled The Trap, was submitted for season 2. It was rejected because the robots were deemed too similar to the Mechanoids, then set to feature in The Chase. Three years later, Holmes re-submitted the outline as The Space-Trap to a new, more receptive production team. The script — under the name The Space Trap (without hyphen, as here) — was actually commissioned for delivery in 1969, probably for the penultimate story of Season 6. However, because Holmes had completed the scripts early, the story went into production in late 1968 when a Dick Sharples story, Prison in Space, fell by the wayside.
  • Episode one exists as a 35mm black-and-white film negative, while the others exist as 16mm film negatives[1].
  • As of today, this story has the most title-drops of any Doctor Who story, at 72.
  • Robert La'Bassiere — billed as playing one of the Krotons in the closing credits for episodes two to four — was actually a pseudonym for Robert Grant, who had requested that he be credited under this name both on-screen and in the Radio Times programme listings.
  • This is the first collaboration between writer Robert Holmes and script editor Terrance Dicks. It was only Dicks's second story in that capacity. In a neat bit of symmetry, Horror of Fang Rock was one of script editor Robert Holmes's last stories, written by Terrance Dicks.
  • David Maloney called the story "a disaster" and felt it was his fault, while Frazer Hines didn't care for it either, calling it "horrible". Terrance Dicks felt that it worked as a story, but not as a monster, feeling the Krotons themselves were useless and non-threatening.
  • The Krotons were written with the intent of replacing the Daleks as the Doctor's principle nemesis, as Terry Nation had asked The BBC to stop using them so that he could pitch his own Dalek series to US TV networks, which ultimately fell through. Unfortunately, the Krotons didn't have the same impact the Daleks had, and they faded into obscurity, with Nation eventually allowing the Daleks to return to this series midway through the Third Doctor's era.
  • Frazer Hines would have originally departed in this story (or at least, the one that filled its slot) and been replaced with a male companion named Nik. He ultimately decided to leave along with Patrick Troughton.
  • The Krotons was repeated on BBC2 in November 1981 to celebrate The Five Faces of Doctor Who and bridge the gap between Seasons 18 and 19. At the time, it was the only four-part Second Doctor serial that fully existed in the BBC Archives. All other four-part stories were either incomplete or missing entirely.
  • Robert Holmes envisioned the Krotons as crystalline men. Costume designer Bobi Bartlett opted instead for a more robotic approach.
  • Jack Lovell Ltd were tasked with constructing the Krotons but, in their haste to build the monsters, they did so to the wrong scale. As a result, the Krotons were larger and more unwieldy than intended and a rubber skirt had to be added to hide the operator's legs, which would otherwise now be exposed.
  • Eelek was originally called Avrik, while the Dynotrope was originally named the Dynotron.
  • Wendy Padbury found her PVC dress to be very impractical, because it was so prone to getting torn.

Ratings[[edit] | [edit source]]

  • Episode one - 9.0 million viewers
  • Episode two - 8.4 million viewers
  • Episode three - 7.5 million viewers
  • Episode four - 7.1 million viewers

Myths[[edit] | [edit source]]

  • The Krotons were the winning entry in a Blue Peter "design a monster" competition. (One of the winning entries in a Blue Peter design a monster competition, the "Aqua-Man", resembled a cardboard box with legs and arms — similar to the Krotons' appearance.)

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.
  • Beta is simultaneously in his lab and underneath the Learning Hall at the end of episode three.
  • In the opening shot of the story, the sliding hatch that opens to allow Selris to receive instructions from within clearly gets stuck before being jerked free from behind the scenes.
  • The rock the Doctor places on the outer door of the machine falls straight down in close shot but is nowhere to be seen in long shot right afterwards.
  • The lines spoken by the Krotons at the end of episode two are not exactly the same as those spoken at the beginning of episode three.
  • Richard Ireson (Axus) trips up on one of his lines in episode four, saying "if we don't hand over the strangers, they'll kill us any anyway". Who will do the killing — the strangers or the Krotons?
  • After the Doctor drops one of the Krotons' headsets in episode four, he is then shown properly placing it on his head. However, when the camera cuts to a shot of a Kroton and then back to the Doctor, the headset is off his head again without explanation.

Continuity[[edit] | [edit source]]

Is this act of hypnotism a sign of psychic times to come?

Home video and audio releases[[edit] | [edit source]]

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

This story was released on DVD in the UK on 2 July 2012. The DVD extras include:

  • Region 2 DVD cover

    Region 2 DVD cover

  • Region 1 DVD cover

    Region 1 DVD cover

  • Region 4 DVD cover

    Region 4 DVD cover

Digital releases[[edit] | [edit source]]

This story is available:

  • The Krotons iTunes cover

    The Krotons iTunes cover

  • Best of Second Doctor collection iTunes cover

    Best of Second Doctor collection iTunes cover

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

  • This story was released on video as The Krotons in episodic format in 1991.
  • AUS VHS Cover

    AUS VHS Cover

  • US VHS Cover

    US VHS Cover

  • UK VHS Cover

    UK VHS Cover

  • CD release

    CD release

Footnotes[[edit] | [edit source]]

  1. ↑ Quick Archive

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

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