Regeneration

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The Doctor regenerates into his sixth incarnation. (DW: The Caves of Androzani)
The Doctor regenerates into his tenth incarnation. (DW: The Parting of the Ways)
This article is about the Time Lord physiological process. For other uses of Regeneration, see Regeneration (disambiguation)

Regeneration was the process by which Time Lords (and a few other life-forms) could renew themselves by complete physical change, either at will or because of near-fatal illness or injury. The term Regeneration was often used in place of incarnation, but referred to the number of regenerations that the individual had had (eg, the Fifth Doctor was the Doctor's Fourth Regeneration)

Background

Process

Appearance

During the Master's regeneration, the Time Lord seemed to shed excess energy from his wrists. The energy appeared to fall to the floor of the TARDIS. (DW: Utopia)

During a regeneration, the body often shines with milky white light also known as bio-energy (DW: Logopolis, Time and the Rani, Doctor Who) or with a violent-seeming discharge of bio-energy. (DW: The Parting of the Ways, Utopia, The Stolen Earth, The End of Time) In other cases, there was no visible energy discharge. (DW: Planet of the Spiders, Destiny of the Daleks)

The colour of bio-energy released during regeneration may be different between individual Time Lords, as the Doctor's have released golden-orange energy while the Master's released brilliant white energy.

Just prior to his ninth regeneration, the Doctor warned his companion to keep away from him (during a partial regeneration, Jack did this as well). This would seem to imply that the energy released during the process posed some level of danger to Humans, and possibly that them being too close may pose a danger to the Time Lord. (DW: The Parting of the Ways, The Stolen Earth) The damage done to the TARDIS during the Tenth Doctor's regeneration into the Eleventh (enough to force a complete reconstruction) may be an example of the potential dangers the regeneration energy can pose to those who stand too close. (DW: The End of Time) However at least one regeneration occurred with other individuals seen in close proximity (although this was assisted by the transient Watcher, who may have helped to contain the regenerative energy). (DW: Logopolis)

The damage done during the Tenth/Eleventh regeneration may have been caused by his resistance to the regeneration or the high amounts of radiation expelled.

Physical and Mental Change

In the case of the Doctor, the new form has often been physically younger and healthier (in human terms) than the Time Lord's previous incarnation, though this hasn't always been the case (see, for example, the contrast between his fifth and sixth incarnations). Other Time Lords have regenerated into both younger (Romana) and older (Borusa) bodies. The Time Lord might gain or lose height and body mass. After each regeneration there is often a marked change in personality. During the process of regeneration there are the genetic equivalent of 'bit errors' in the DNA of the regenerated cells. This is what causes the appearance of the Time Lord to change; because even the cells of the brain regenerate as well, their brain chemistry and organisation will change. Although the aspects of their personality caused by "nurture" will not change, the "nature" contribution to their personality will change. (BFA: The Sirens of Time) Time Lords of the Oldblood Houses, born with just one heart, grew a second heart upon regeneration. This included the Doctor, who in his first incarnation had only one heart. (MA: The Man in the Velvet Mask)

When one of the Doctor's hearts stopped he wonders aloud how humans can cope with just one, suggesting he has never experienced a single heartbeat. (DW: The Shakespeare Code) However as he was in his tenth incarnation at the time, it may have been so long since he last had the experience he may have forgotten what it was like.

The Eleventh Doctor feared that he had become a woman, confirming that it is a possibility when it comes to regeneration (or that the mania sometimes experienced during regeneration caused him to jump to this conclusion hastily). (DW: The End of Time) This was justified by the fact that regeneration is very random and, as the Ninth Doctor told Rose Tyler, "You never know what you're going to end up with". He also stated prior to that comment that he could even have grown another head due to regeneration, though he may have been joking as he also suggested that an unlikely "no head" outcome was possible (DW: The Parting of the Ways) Otherwise. all known naturally occurring Time Lord regenerations have remained humanoid with all vital limbs and organs in place. Nonetheless, the Doctor's eleventh incarnation made it a priority - even amidst serious damage to his TARDIS - to immediately conduct a physical inventory to make sure he still had two legs and sufficient fingers. (DW: The End of Time)

The Doctor's ability to regrow a severed limb soon after regeneration (DW: The Christmas Invasion) suggests the possibility that had the eleventh incarnation, for example, discovered a deficiency - a missing leg, for example - he might have been able to rectify the situation.
File:Doctorinpain.jpg
The Doctor going through post-regeneration trauma. (DW: The Christmas Invasion)

After-Effects

During the first few hours of the regeneration, the Time Lord will often suffer from confusion, erratic behaviour and memory loss. The Doctor, in particular, though not so much other Time Lords, has exhibited mood swings and confusion. It took some time for his newly-regenerated fifth incarnation to remember his own identity. (DW: Castrovalva) On one occasion, he attempted to strangle Peri to death before re-asserting control of himself (DW: The Twin Dilemma) and on another he almost crashed the TARDIS (DW: Children in Need Special) Following his tenth regeneration, the Doctor experienced powerful, rapidly alternating food cravings, declaring a certain type of food his favourite one minute, and saying he hated it the next. (DW: The Eleventh Hour) A Zero Room could help with this, as it removed all outside distractions. (DW: Castrovalva)

If they are knocked unconscious, the whole process might be started all over again (DWN: The Power of the Daleks), but this is not a certainty (DW: The Eleventh Hour). After a while, the Time Lord's body will have settled down, though they can regrow limbs within the first 15 hours of the regeneration due to having enough residual energy. (DW: The Christmas Invasion) After his first regeneration, the Doctor implied that his TARDIS helped the process along. (DW: The Power of the Daleks) Some Time Lords, however, may regenerate with little or no overt complications, for example, Romana. (DW: Destiny of the Daleks) Even after the physical transformation, changes might occur, as the Doctor believed could happen. (DW: Robot) The Doctor's hair, for instance, went from longer to shorter to longer in the space of a few days. (MA: Cold Fusion) For a short time after regenerating, a Time Lord displays greater strength then usual; The Doctor's fourth incarnation was able to karate-chop a brick in half while recovering from his regeneration (DW: Robot), and his eighth incarnation managed to break down a steel door bare-handed immediately following his. (DW: Doctor Who) This strength may be caused in a similar process as human adrenaline spikes.

Limitations

Though Time Lords could regenerate after severe injuries — one Time Lord even beginning to regenerate a complete body after being decapitated (EDA: The Shadows of Avalon), the process only being cut short when a Time Lord is stabbed through both hearts before it can finish — regeneration does not seem to be guaranteed. The Doctor, for example, was at one point convinced that he was going to die at the hands of the Gelth (DW: The Unquiet Dead), although it is possible he meant the particular incarnation, and there have been numerous occasions in his lifetimes where survival, including regeneration, was not assured. Maxil implied that a fatal blast from a staser (an energy weapon used by the Chancellory Guard on Gallifrey) could prevent regeneration. (DW: Arc of Infinity) Stabbing or shooting a Time Lord through both hearts at the same time (EDA: The Shadows of Avalon, PDA: World Game), or drowning, if it happened quickly enough (DW: Turn Left) could also end a Time Lord's life regardless of how many regenerations they have left. Burning out the hearts simultaneously would have the same effect as stabbing or shooting them simultaneously (DW: Silence in the Library/Forest of the Dead). Acid could also render the ability to regenerate impossible (NSA: Night of the Humans)

As well, the interference of some medications, such as anaesthesia, may disrupt or destroy the regenerative process. (DW: Doctor Who)

The Regenerative Cycle

The Time Lords had a limited regenerative cycle of twelve regenerations, consisting of thirteen incarnations, after which they had no more regenerations and would suffer permanent death. (DW: The Deadly Assassin, Doctor Who) Time Lords can will themselves to die by regenerating when they have no more regenerations left to use, as Azmael chose to do (DW: The Twin Dilemma) and can also, with enough effort, prevent a regeneration and die permanently should they desire. (DW: Last of the Time Lords) Other life forms (for example, the Minyans) could have hundreds of regenerations. Rassilon apparently had physical reasons to impose this restriction. (BFA: Zagreus)

As with most such "rules" there were occasionally exceptions to the twelve regeneration limit. The High Council, offered the Master a new regenerative cycle if he complied with rescuing the various incarnation of the Doctor from the Death Zone. (DW: The Five Doctors) Although he did not receive this award on that occasion, during the Last Great Time War the Master was given the ability to regenerate once more. (DW: Utopia)

The crew of the Minyans' ship the P7E, however, had had about a thousand regenerations, by which time, however, they wearied of life. (DW: Underworld) Mawdryn and his followers, who had stolen the Time Lords' regeneration technology, also had an apparently limitless number of incarnations, though they had no control over when it would happen and what form, often grotesque, they would change into. Consequently, they also longed for death, making their mutations of a kind of de facto punishment by the Time Lords for stealing their technology. (DW: Mawdryn Undead)

Attitude Toward Regeneration

As noted above, regeneration is not guaranteed, as the Doctor on numerous occasions believed he was in danger of actually dying. Even with regeneration a possibility, the Doctor has come to consider such a change as being nonetheless a "death". In recollecting the events surrounding the Master's attempt at stealing the Eye of Harmony, the Doctor referred to his incarnations as "lives". (DW: Doctor Who: The Movie) Sometime Time Lords such as the War Chief were uncorncerned about wasting Regenerations while others such as the Doctor warned not to waste them. (PDA: Invasion of the Cat-People) Iris Wildthyme once confided in Samantha Jones, saying that regeneration was treated on Gallifrey the same way sex is on Earth. (EDA: The Scarlet Empress)

The Doctor's opinions towards regeneration seemed to change in his later regenerations, considering it more true death. In his ninth incarnation, the Doctor bade farewell to his companion, ("I'm not gonna see you again. Not like this.") even though he was not actually dying. (DW: The Parting of the Ways) The Doctor's tenth incarnation was concerned regarding a prediction made regarding his own impending regeneration, saying "Even if I change, it feels like dying. Everything I am dies. Some new man goes sauntering away...and I'm dead." (DW: The Waters of Mars, The End of Time)

Control Over Regeneration

Generally, regeneration is initiated when a Time Lord has been too badly injured to survive. However in some cases Time Lords have been known to exercise control over the process. Romana appeared to regenerate on a whim, (DW: Destiny of the Daleks) while Azmael initiated a thirteenth regeneration in order to end his life (DW: The Twin Dilemma).

The degree of control that Time Lords have over their end appearance is unclear. The Master was able to make his next regeneration as young as the Doctor was at the time, though since most regenerations lead to younger bodies this may have been a coincidence. (DW: Utopia) Romana seemed adept enough at the process to custom design her new appearances, trying several bodies before finally deciding on a copy of Princess Astra. The Doctor criticised Romana for taking on the form of another person, suggesting such things were not unheard of. (DW: Destiny of the Daleks) In contrast to Romana, the Doctor did not appear to have much control over his post regeneration appearance; after his fourth regeneration he commented "that's the problem with regeneration, you never quite know what you're going to get" (DW: Castrovalva), and would restate this immediately prior to his ninth regeneration (DW: The Parting of the Ways) However as the Doctor's regenerations have thus far either been forced on him or been triggered when an incarnation has been mortally wounded, it may be that the appearance of the next incarnation can be controlled if the regeneration is voluntarily triggered (such as Romana's).

While skilled Time Lords can choose their new form with a voluntarily induced regeneration, the process has the potential to go horribly wrong and leave the Time Lord in a severely misshapen body. The problem is then often exacerbated by the Time Lord trying to solve the problem by immediately starting another regeneration instead of obtaining medical assistance, which only amplifies the defects in the regeneration. The end result of several too close regenerations, whether self-initiated or not, is inevitably a mutated monstrosity that can only be put out of its misery by complete disintegration. (DWN: The Twin Dilemma)

Some Time Lords were capable of momentarily regenerating, or partially regenerating. Though this could use up a lot of regenerative energy, it could give the Time Lord a new set of genes, allowing them to fool genetic sensors. The Doctor used this method to on the planet Purgatory in order to fool the genetic scanner used by the Landsknechte. (NA: Original Sin)

The Time Lords were apparently capable of controlling the regeneration of individual Time Lords, either forcing a regeneration, influencing the new appearance (DW: The War Games) or removing later regenerations (DW: The Ultimate Foe).

With some difficulty, Time Lords could resist regeneration, thereby effectively committing suicide. (DWN: The Power of the Daleks) The Master did so after being shot, ostensibly to avoid becoming the Doctor's eternal prisoner. (DW: Last of the Time Lords) Later events showed, however, that he had a complex plan already in motion to provide for the resurrection of that incarnation, rather than using up a regeneration. (DW: The End of Time) Similarly, the Doctor once threatened System with resisting regeneration in order to stop the device from learning the biological details of the act. (BFA: The Gathering) This is not always an option, however, as the Doctor notes fearfully that while his companion can die only once, he may have to repeatedly regenerate and live out all of his life times when the TARDIS stalls in the middle of space. (DW: Vengeance on Varos)

Time Lords seemingly developed a means for artificial life forms to undergo regeneration as well; the robot dog K9 Mark I was fitted with a Regeneration unit which allowed him to upgrade to a significantly more advanced model following his self-destruction. (K9TV: Regeneration)

It is possible that the Korven and not the Time Lords created the regeneration unit due to K9's affiliation with them. (K9TV: Hound of the Korven)

Difficult or Unusual Regenerations

Regenerative Difficulty

The Doctor expels regeneration energy from his mouth after a relatively successful regeneration. (DW: The Eleventh Hour)

While most regenerations seemed to cause moments of mental instability (with some degree of temporary amnesia often noted), some offered particularly profound instances of physical peril. The Doctor feared that his fourth regeneration "was failing" when he found himself reverting into previous personas, and could only be righted with the use of the Zero Room of the TARDIS. (DW: Castrovalva) Later, the Doctor claimed that anesthesia had "nearly destroyed the regenerative process" during his seventh regeneration, as a possible explanation for the particularly severe amnesia he suffered afterwards. (DW: Doctor Who) Still later, one of the the Doctor's hearts stopped beating for a prolonged period of time, and he began to exhale regenerative energy when his ninth regeneration went "a bit wrong", after which he slipped into a coma-like state for most of a day. (DW: Children in Need Special, The Christmas Invasion)

For other species, a metamorphic symbiosis regenerator was said to be able to provide help when regenerations failed. (DW: Mawdryn Undead)

Meta-Crisis

The Doctor begins what would be an aborted regeneration. (DW: The Stolen Earth)

A Time Lord can prevent death and regeneration by focusing the regenerative energies into a severed appendage, like the Doctor's hand. His hand siphoned off the excess energy that would have changed his appearance while the Doctor used just enough to heal himself from the injury sustained by a Dalek Gunstick. This resulted in the appendage storing enough energy to actually grow a nearly identical Time Lord after it came in contact with Donna Noble. As a consequence, the Doctor appeared to regenerate and heal but did not change. (DW: Journey's End)

It is unknown if this used up one of the Doctor's regenerations.

Cross-Species Transformations

Though they did not undergo normal regenerations, as noted elsewhere, Mawdryn underwent many mutations of physical form. (DW: Mawdryn Undead) I.M. Foreman, a Gallifreyan (but not a Time Lord) absorbed the DNA around him and underwent indescribable changes as a result of mutations, transcending sex, species and even physical existence itself. (EDA: Interference - Book One, Interference - Book Two) Romana, prior to her regeneration in to her second incarnation, appeared to have taken on a Near-Human blue-skinned form. (DW: Destiny of the Daleks)

One account states that the TARDIS itself, rather than Romana, adopted this shape. (ST: The Lying Old Witch in the Wardrobe)

Aborted Regeneration

Occasionally, a regeneration will fail and the regeneration will abort. Though the Time Lord will have regenerated, they are severely deformed. Though Time Lord technology can treat this, in some occasions the damage will be too severe to fix.

After being shot by the War Lords, the War Chief was barely able to survive. While being taken back to the War Lords' planet, his body attempted to regenerate. Due to the massive injuries and the lack of medical care, this regeneration aborted, which meant he had two conjoined individual bodies, poorly fused together. (NA: Timewyrm: Exodus)

Scientific Explanation

The exact mechanism that makes regeneration possible has not been stated. Varying explanations may or may not be compatible with each other.

  • One explanation was that Cardinal Rassilon had been investigating a method of regenerating decaying and diseased tissue via a series of permanently carried self-replicating biogenic molecules. The cells of a Gallifreyan body could be repaired, restored and re-organised. This would result in a wholly new physical form. The brain cells would similarly be rearranged, though to a lesser degree, thus ensuring the new incarnation will replicate the memories and personality of the former incarnation. Rassilon intended for this mechanism only to be used upon the Gallifreyan elite. He also inputted a parameter of 12 regenerative cycles to avoid decaying biogenic molecules. (BFA: Zagreus)
  • Another theory attributes regeneration to a "nanomolecular virus" that rebuilds the body much like the "self-replicating biogenic molecules". (REF: The Gallifrey Chronicles)
  • One partial explanation of the process links it to the release of massive amounts of a hormone known as lindos at moments of extreme trauma, with the hormone triggering the regeneration itself. Recently-regenerated Time Lords can be identified by the raised levels of lindos in their system. (DWN: The Twin Dilemma, BFA: Unregenerate!)
  • At one point it was stated that Time Lords have "packets" of regeneration energy within their bodies, one for each life. These packets can be physically removed from a Time Lord's body, essentially robbing them of their regenerations. (DW: Mawdryn Undead)

Specific Regenerations

Time Lords

The Doctor

The rapid aging effects of the Time Destructor which occured sometime before may have has a role as well.
It is not known at present whether this incident counts against the Doctor's allotment of regenerations.
  • Tenth to eleventh incarnation: The Doctor was massively irradiated in the process of saving Wilfred Mott. As with the Third and Seventh Doctors, regeneration did not immediately set in, and this Doctor was able to spend an indeterminate amount of time revisiting past companions before finally succumbing. On this occasion, he regenerated so explosively it caused massive damage to the TARDIS and set it on fire. (DW: The End of Time)
File:200px-Ten regenerates.jpg
The Tenth Doctor's regeneration. (DW: The End of Time)

On most of the above occasions, the Doctor has regenerated in the presence of other individuals (usually companions). Known exceptions include his seventh and tenth regenerations which occurred when the Doctor was alone; it is not known for certain whether his second or eighth regenerations occurred in the presence of others.

Of the Doctor's recorded regenerations to date, six have occurred with the Doctor lying in a prone position, while two (as well as the partial regeneration) occurred with him standing upright. At least four of the regenerations (first, third, sixth and seventh) occurred with the Doctor apparently unconscious (or, in one instance, already "dead"), while he appeared to remain conscious during his fourth, fifth, ninth and tenth regenerations. His first, fifth, sixth, ninth and tenth regenerations (plus the partial) occurred within the TARDIS; his third, fourth, and seventh occurred outside the ship, with his seventh regeneration the only occasion where he regenerated completely on his own without any assistance from the TARDIS or other Time Lords (The exact nature of his second and eighth regenerations remains unknown).

Exact dates are known for two of the Doctor's transformations: Seventh to Eighth (31 December 1999) and Tenth to Eleventh (1 January 2005), although in the latter case the regeneration occurs after the Doctor dematerializes the TARDIS, leaving it uncertain whether the TARDIS was still present on that date when the change occurred, especially as it proceeded to crash land near Gloucester, England in 1996. (DW: The Eleventh Hour).

Alternate Doctors
  • The Doctor (Unbound 3): Shot by Ruth after she learned the truth about his role in her father's death; she shot him again when he regenerated and so on. (BFA: Full Fathom Five)

The Master

These accounts contradict each other somewhat. Possibly, not all were used up in the two instances.
It is not known for certain if the incarnation of the Master later "executed" by the Daleks is this same individual.
Neither of these new bodies were, strictly speaking, regenerations.
The Master had been resurrected to fight the Last Great Time War at this point, and probably had a new regenerative cycle bestowed upon him (per offer made in The Five Doctors). Although the Saxon Master's body is reconstituted and brought back to life The End of Time, it is the same incarnation as previous, so this doesn't necessarily count as a "regeneration". It is unclear if he was merely unwilling to regenerate until his body totally failed or if he could not because his resurrection was sabotaged.

Romana

One account suggests that she did so to prevent her possession by the evil entity Pandora (BFG: Lies), another that the Key to Time had secretly harmed her (ST: The Lying Old Witch in the Wardrobe). The Doctor, soon after one regeneration, was able to regrow a severed hand (DW: The Christmas Invasion), offering a possible explanation as to how Romana was able to initially choose several different appearances -- including twice choosing that of Astra.

Rassilon

Rassilon was said to have achieved a cycle of perpetual regeneration, becoming immortal. It was for this secret that Lord President Borusa sent four of the Doctor's incarnations and their companions into the Death Zone, where Rassilon lay in eternal sleep in the Dark Tower. (DW: The Five Doctors)

Rassilon again became president in the Last Great Time War; it would seem that he was awakened from his eternal sleep and regenerated to renew himself for the war. (DW: The End of Time)

K'anpo Rimpoche

Attacked by Eight Legs and regenerated by merging with his assistant Cho Je. (DW: Planet of the Spiders)

Borusa

Borusa regenerated at least 3 times, having at least 4 lives. (DW: The Deadly Assassin, DW: The Invasion of Time, DW: Arc of Infinity, DW: The Five Doctors)

Rallon

Initiated all twelve of his regenerations to stop the Celestial Toymaker. (PDA: Divided Loyalties)

Azmael

  • In his Thirteenth and Final body he regenerated past his limit, killing him and Mestor who possessed Azmael's body after his own was destroyed. (DW: The Twin Dilemma)

Iris Wildthyme

Regenerated following a lengthy period of illness following the consumption of a live Kaled mutant. (EDA: The Scarlet Empress)

Jenny

Regenerated several hours after being shot by Cobb. (DW: The Doctor's Daughter)

However it is possible that she entered a healing coma, was restored by residual energy from The Source, or was healed by her body's residual cellular energy due to her being within 15 hours (although this is reliant on her 'birth' somehow generating extra cellular energy as a regeneration would).

The War Chief

Underwent a faulty regeneration after being shot by War Lords. This resulted in his new form appearing like two bodies fused together. (NA: Timewyrm: Exodus)

Mortimus

Mortimus regenerated at least once. (BFA: The Book of Kells)

Humans

The Brigadier

Regenerated in 2010, which renewed his youth. (NA: Happy Endings)

Chris Cwej

Regenerated by force to survive radiation poisoning (BNA: Tears of the Oracle)

Gallifreyans

I.M. Foreman

As a priest, he had been given the gift of regenerations. This made 12 different individuals, who were created from absorbing the DNA around him. (EDA: Interference - Book One, Interference - Book Two)

Robots

K9 Mark I

Regenerated by use of a Regeneration unit after self-destructing to defeat a group of Jixen Warriors.(K9TV: Regeneration)

K9 Mark 2

Regenerated using the Regeneration unit after exhausting power core to defeat the Trojan.(K9TV: Eclipse of the Korven)


Behind the Scenes

In The Power of the Daleks, the next story, the Doctor said that he had been "renewed", and also said that the change was partly due to the TARDIS, partly to himself, without elaborating. Originally, the Production team meant for the Doctor to have used the TARDIS to reverse time and "rejuvenate" himself, though they may have abandoned this explanation by the time Patrick Troughton took over the role.
The change in the Doctor's appearance was meant to occur several stories earlier, during The Celestial Toymaker, with the Toymaker capriciously having changed the Doctor's appearance out of spite. (The Doctor is invisible and unable to speak for most of the story anyway.) The reason for the change of plan is unknown. Either it was decided to retain Hartnell in the role for a few more stories, or the actor was accidentally issued with a new contract by mistake, making it impossible to recast the Doctor at that moment in time. (A plot device similar to this would occur in The Mind Robber to cover Frazer Hines' temporary replacement by his cousin, Hamish Wilson, after Hines contracted an illness.)
  • The changeover was not actually referred to as "regeneration" until the end of Planet of the Spiders, when the Third Doctor (Jon Pertwee) changed into the Fourth (Tom Baker). Prior to this, the Doctor was simply described as having "changed his appearance."
  • Fans and the general public have long speculated as to whether the Doctor could change sex as a result of a regeneration. The Time Lord I.M. Foreman having changed sex as a result of regeneration implies that this can happen. Female versions of the Doctor appeared in the non-canonical The Curse of Fatal Death and in the Doctor Who Unbound story Exile. It may have gained further support as the 11th Doctor at first thought he had regenerated into a female. In the audio drama The Two Irises, Iris Wildthyme encounters a future, male incarnation of herself. In The End of Time the newly regenerated Doctor shouts out "I'm a Girl!" however this was just seconds after Regeneration and it is most likely this was Post-Regenerative Trauma.
  • In the original 1963-89 series, plus the 1996 TV movie, each regeneration was treated differently on screen, using a variety of special effects ranging from simple cross-fades to a CGI "morph" in the 1996 film. With the return of Doctor Who in 2005, producer Russell T Davies decided regenerations would take a consistent form, with the Time Lord in question standing upright, arms outstretched, and blinding energy flying out from the head, arms, and legs. So far, the four regenerations depicted on screen (three featuring the Doctor in The Parting of the Ways, The End of Time and The Stolen Earth; one featuring the Master in Utopia) have taken on this form. And all four have also occurred within the TARDIS. It remains to be seen if any future on-screen regenerations will retain the same format.
  • It is interesting to note that, despite being the Doctor's "greatest enemy", the Daleks have directly or indirectly caused less of the the Doctor's regenerations than his own race (the Time Lords).This is because the Daleks have only been in two adventures that forced the Doctor to regenerate (the Eighth to Ninth Doctor regeneration's circumstances is unknown), whereas a Time Lord has had a hand in three of his regenerations.

First and Last words

The Doctor's Last Words

Doctor Episode Last Words
First Doctor The Tenth Planet "Yes, that's good, keep warm."
Second Doctor The War Games "Is this some sort of joke? No, I refuse to be treated in... What are you doing? No! Stop! You're making me gidy... no, you can't do this to me! No, no, no, no, no, no, no, no, no, no, no, no, no...!"
Third Doctor Planet of the Spiders "A tear, Sarah Jane? No, don't cry; while there's life, there's..."
Fourth Doctor Logopolis "It's the end. But the moment has been prepared for..."
Fifth Doctor The Caves of Androzani "Too late, Peri; Going soon... time to say goodbye. I might regenerate, I don't know; it feels different this time... Adric?"
Sixth Doctor Spiral Scratch "Local... tractor beam..."
Seventh Doctor Doctor Who: The Movie "Puccini... Madame Butterfly. What you're about to do, stop! No! I am not human. I am not like you! I need a beryllium atomic clock! This is 1999, isn't it? No, I'm not human! I'm not human! Timing malfunction! The Master! He's out there. I've got to stop him!"
Ninth Doctor The Parting of the Ways "Rose... Before I go I just wanna tell you, you were fantastic. Absolutely fantastic. And do you know what? So was I."
Tenth Doctor

The Stolen Earth

The End of Time

"I'm sorry; it's too late... I'm regenerating!"

"I don't want to go."

The Doctor's First Words

Doctor Episode First Words
Second Doctor The Power of the Daleks "Slower... slower! Concentrate on one thing... one thing! It's over... It's over!"
Third Doctor Spearhead from Space "Shoes... must find my shoes."
Fourth Doctor Robot "Sontarans perverting the course of human history... Don't worry, Brigadier, the brontosaurus is large and placid... and stupid! If the square of the hypotenuse equals the sum of the square of the other two sides, then why is a mouse when it spins? Never did find the answer to that one."
Fifth Doctor Castrovalva "Ah. You've come to help me find the Zero Room. Welcome aboard, I'm the Doctor... or will be if this regeneration works out."
Sixth Doctor The Caves of Androzani "You were expecting someone else?"
Seventh Doctor Time and the Rani "Oh no, Mel... ah! That was a nice nap. Now down to business. I'm a bit worried about the temporal flicker in sector thirteen. There's a bicentennial refit of the TARDIS to book in. I must just pop over to Centauri Seven and then perhaps a quick holiday. Right, that all seems quite clear. Just three small points. Where am I? Who am I? And who are you?"
Eighth Doctor Doctor Who "Who am I? Who am I?"
Tenth Doctor The Parting of the Ways

Journey's End

"Hello. Oka-- mmmmm. New teeth. That's weird. So, where was I? Oh, that's right - Barcelona!"

"Right then. Where were we?"

Eleventh Doctor The End of Time "Legs! I’ve still got legs! Good. Arms, hands, ooh, fingers! Lots of fingers! Ears, yes, eyes, two, nose, I’ve had worse, chin... blimey! Hair... I'm a girl! No! No, I'm not a girl. And still not ginger! And something else, something important, I'm... I'm... I'm... Ha! Crashing! Ha-ha-ha! Whoo-hoo-hoo! Geronimo!"

The Master's Last Words

Master Episode Last Words
Tersurus The Keeper of Traken "So... A new body at last."
Bruce Doctor Who: The Movie "Never! DOCTOR..."
The Master (Yana) Utopia "Killed by an insect... a girl! How inappropriate. Still, if the Doctor can be young and strong... then so can I! The Master... reborn!"
Harold Saxon Last of the Time Lords

The End of Time

"How about that? I win. Will it stop, Doctor? The drumming? Will it stop?"

"Doctor, get back. You made me, Rassilon. All of my life... 1, 2, 3, 4!"

The Master's First words

Master Episode First Words
Tremas The Keeper of Traken "A new body at last."
Bruce Doctor Who: The Movie "I must find the Doctor; this body won't last long."
The Master (Yana) (After activating the Chameleon Arch) Utopia "Not to worry My Dear, when one door closes another must open."
Harold Saxon Utopia "Ha Ha! Ha Ha Ha! Ha Ha Ha! Oh, Oh! Now then, Doctor! Oh new voice, hello-hello-hello. Anyway, why don't we stop and have a nice little chat, where I can tell you all my plans and you can work out a way to stop me, I don't think."

K9's Last Words

K9 Episode Last Words
K9 Mark I Regeneration (TV story) "Self-destruct commenced! Seven, six, five, four, three, two, one."
K9 Mark 2 Eclipse of the Korven

K9's First Words

K9 Episode First Words
K9 Mark 2 Regeneration (TV story) "G'Day Mates, Bonjour, Hola, Howdy."
K9 Mark 3 Eclipse of the Korven "Affirmitive, Affirmitive, Affirmitive!"
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