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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) 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

Chronotis Edit

  • Salyavin used up all his regenerations when he was attacked by the Sphere. However, when his Type 12 TARDIS was sent backwards, it altered his personal timeline and brought him back to life. (WC: Shada, TV: Shada)

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)

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)

Innocet Edit

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)

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