The dating doctor
The forces of the time vortex began to destroy every cell in his body, and he had to regenerate to save his life.
(TV: The Parting of the Ways) Because of his status as a living fixed point in time, (TV: Utopia) the Ninth Doctor left Jack Harkness behind on Satellite 5 before regenerating, (TV: The Parting of the Ways) planning to tell Rose that Jack would be "rebuilding the Earth".
(PROSE: Engines of War) When the Ninth Doctor answered a call from Mickey Smith in San Francisco, he was told that the phone call was meant for "the other one", and quickly deduced that Mickey was talking about his next incarnation.
He slept through much of the ongoing invasion by the Sycorax.
Experiencing manic hyperactivity, he accelerated the TARDIS' speed.
(TV: Children in Need Special) Crash-landing the TARDIS on the Powell Estate on Christmas Eve 2006, the Doctor fell into a coma after wishing Jackie Tyler and Mickey Smith a Merry Christmas.
(TV: The Ultimate Foe) When Ace was sent into the Seventh Doctor's mind, she discovered a room with thirteen cubicles, seven of them empty, while the other six contained shadowy white figures, representing the Doctor's future incarnations.
(PROSE: Timewyrm: Revelation) After sealing Gallifrey away in a pocket dimension, (TV: The Day of the Doctor) the Seventh Doctor was able to recall teaming up with his other twelve incarnations to save Gallifrey.
The Doctor challenged the leader to a duel over the fate of Earth.