The causes of regeneration, especially amongst Time Lords, were many and varied.

The General's Regeneration - Hell Bent - Doctor Who - BBC

The General's Regeneration - Hell Bent - Doctor Who - BBC

A typical Time Lord regenerates—after being shot by the Twelfth Doctor. (TV: Hell Bent)

They ran the gamut from simple desire to change to sentencing for convictions, to life-threatening maladies, to blunt-force trauma. While all of these might have been cause for alarm in humans, Time Lords sometimes expressed much less concern. As the Twelfth Doctor once told Clara: "We're on Gallifrey. Death is Time Lord for 'man-flu'." (TV: Hell Bent)

That said, he was much less casual about regeneration when it came to his own—an event he fully tried to resist. (TV: The Doctor Falls) Though the First, (TV: Twice Upon a Time) Second, (TV: The War Games) and Tenth Doctors agreed with him, (TV: The End of Time) most incarnations of the Doctor were more at peace with regeneration. In particular, the Third, (TV: Planet of the Spiders) Fourth, (TV: Logopolis) Fifth, (TV: The Caves of Androzani) Eighth, (TV: The Night of the Doctor) War, (TV: The Day of the Doctor) Ninth (TV: The Parting of the Ways) and Eleventh Doctors (TV: The Time of the Doctor) accepted their ends with varying degrees of equanimity.

The following are the known causes of regeneration of specific Time Lords.

The Doctor Edit

The Third Doctor Regenerates - Jon Pertwee to Tom Baker - Planet of the Spiders - Doctor Who - BBC

The Third Doctor Regenerates - Jon Pertwee to Tom Baker - Planet of the Spiders - Doctor Who - BBC

The Third Doctor gets a push to regenerate. (TV: Planet of the Spiders)

Romana Edit

The Master Edit

The Master Regenerates - Derek Jacobi to John Simm - Doctor Who - BBC

The Master Regenerates - Derek Jacobi to John Simm - Doctor Who - BBC

The Master regenerates at the end of the universe. (TV: Utopia)

Rassilon Edit

K'anpo Rimpoche Edit

Borusa Edit

Ailla Edit

Rallon Edit

  • Rallon initiated all twelve of his regenerations at once to force the Celestial Toymaker out of his body; his Watcher subsequently merged with the Toymaker to keep him in check in the future, the Doctor noting that this would mean that the Toymaker himself had essentially regenerated as a person. (PROSE: Divided Loyalties)

Roche Edit

  • Lord Roche was caught in a traffic accident while on Earth; he retained enough control over the process after it began to deliberately shape his new appearance so that he was the exact duplicate of the Third Doctor. (PROSE: The Suns of Caresh)

Tauras Edit

Janartis Edit

  • Janartis was attacked by pig-rats and K9's stun laser and forced to regenerate, but because he was infected by the Dogma Virus, he became a pawn for Free Time. (AUDIO: Panacea)

Azmael Edit

  • In his thirteenth and final body, Azmael deliberately regenerated past his limit, killing him and Mestor, who had been attempting to possess Azmael's body after his own was destroyed. (TV: The Twin Dilemma)

The Eleven Edit

Iris Wildthyme Edit

The War Chief Edit

  • The War Chief underwent a faulty regeneration after being shot by War Lords; lack of medical care and the scale of the damage sustained resulted in his new form appearing like two bodies fused together, the damage preventing him from ever regenerating again. (PROSE: Timewyrm: Exodus)

Ruath Edit

  • Ruath drained every drop of her blood from her body to restore Vampire Lord Yarven. Yarven subsequently turned her new incarnation into a vampire. (PROSE: Goth Opera)

Ophiuchus Edit

  • Dying from an unknown cause, Ophiuchus was saved by the Fifth Doctor who gave him a "little push" having been convinced by Nyssa and Tegan and regenerated. (COMIC: Ophiuchus)

Innocet Edit

Verne Edit

  • After voting for the side opposing those who had sponsored his rise to power, Verne was caught up in a fight and was so badly injured that he was forced to regenerate into an incarnation that had a plain face and a laughably high voice.
  • Upset at this, he immediately forced himself to regenerate again, this time into a deformed old man.
  • A third regeneration resulted in an amorphous blob.
  • A fourth resulted in a monstrosity which was ordered to be destroyed by the Lord President. (PROSE: The Twin Dilemma)

Glospin Edit

  • Glospin force-regenerated himself into the double of the First Doctor after acquiring a genetic sample to influence the appearance of his next incarnation. (PROSE: Lungbarrow)
  • Having killed Quences while disguised as the Doctor, Glospin regenerated again to conceal his role in the murder. (PROSE: Lungbarrow)

I.M. Foreman Edit

  • As a priest, I.M. Foreman had been given the gift of regenerations. This made twelve different individuals, who were created by his body absorbing the DNA around him; all regenerations were caused by the Third Doctor sending Foreman's first twelve bodies back to Gallifrey's past so that they fell from a great height, each regenerating into their next body, the trauma of the regeneration causing each incarnation to lose their memories. (PROSE: Interference - Book One, Interference - Book Two)

Cavisadoratrelundar Edit

  • A Time Lord agent, Cavis nearly regenerated after she was decapitated by Queen Regent Mab, but Mab also stabbed her in both hearts to ensure that she remained dead. (PROSE: The Shadows of Avalon)

Epsilon Delta Edit

Gandarotethetledrax Edit

  • A Time Lord agent, Gandar was stabbed in the heart by Margwyn but regenerated as Margwyn missed his second heart. (PROSE: The Shadows of Avalon)
  • Gandar regenerated again shortly after his previous regeneration when he received a fatal sword wound; his new incarnation resembled a hybrid of human and Silurian and was far more peaceful than his previous violent selves. (PROSE: The Shadows of Avalon)

Louis Edit

Elbon Edit

River Song Edit

Karlax Edit

Volstrom Edit

Ollistra Edit

The General Edit

Thessalia Edit

Larissa Edit

Pavo Edit

Trave Edit

Kallix Edit

Proto-Time Lords Edit

  • Brooke regenerated for the first time after being shot by River Song. (AUDIO: My Dinner with Andrew)
  • Lake's first regeneration was induced after he was mortally wounded by an unstable fuel cell. Seeking to determine the number of times he could do so, he tested the ability of his fellow Proto-Time Lords by inflicting fatal injuries on them or convincing them to commit suicide. Ironically, Lake's last victim was his third and final incarnation, a girl who became known as Lily after losing her memory of her prior lives. Having witnessed Lake regenerate into Lily after mortally wounding him in anger for murdering her, River Song was forced to send Lily back in time so she would meet her fate. (AUDIO: The Lady in the Lake)
  • Wadi's regenerations were all expended through fatal injuries inflicted by Lake. (AUDIO: The Lady in the Lake)
  • As part of his religious cult, Lake convinced Stream, Beck and Creek, to die multiple times on Terminus Prime so he could covertly study regeneration and find out how long he was able to live. (AUDIO: The Lady in the Lake)
  • Rindle first regenerated after being mortally wounded by a wild beast. He regenerated again, this time into a female form, by Lake when he mistook him for an imposter. Catching up with her, Lake forced to regenerate again, now becoming an older man, before expending Rindle's remaining regenerations to power his ship. (AUDIO: The Lady in the Lake)
  • Deceived by Lake into believing that regeneration was a constant rebirth, Tarn went to Terminus Prime to commit suicide so he could continually be born again. By the time he met River, he had already died eight times. He was killed again by Kevin and then again by Dave, regenerating at least ten times. (AUDIO: The Lady in the Lake)