Don’t tell anyone, but after a disastrous regeneration, the Tenth Doctor regenerated into the Eleventh as a… cat.
Yes, a cat.
Don’t believe me? Take a look at the photo!
With no one else to turn to, he sought out his old, trusted companion Rose Tyler, and together the two of them went off looking for a quite life.
Finally, they settled in the town of Snowce, in Simland, in a little house called the Tardis. Unknown to the rest of the inhabitants of Snowce, the Tardis is of course the refurbished police box Tardis that was the Doctor’s time machine in his two-legged days. But it doesn’t fly anymore since the Doc lost his dexterity. Being the philanthrope that he is, the Doc works in the service industry, bringing joy to the lives of the less fortunate—while also supplementing Rose’s meagre earnings to run the household!
Rumour has it that Jack Harkness is due to join them soon. But whether as dog, cat or human remains to be seen!
(For non-Doctor Who fans: The Doctor is a Time Lord, and they are able to cheat death by regenerating. However, regeneration can sometimes be unpredictable, as in this case! For more, look up Doctor Who on Wikipedia. [See Torchwood for info on Jack.])