The tenth doctor regenerated because he absorbed all the radiation from a radiation chamber to save Wilf's (Donna Noble's grandfather's) life. Wilf knocked four times, so the Doctor knew it was time for him to die (because in effect the tenth doctor dies and the eleventh doctor is born).
Episode: The End of Time (part 2)
I know this all true but actually the doctor was a little bit scared of what will happen to him when he regenerates for the tenth time because he absorbed all the radiation in order to save dona's grandfather so noble family won't respect him as a enemy. The doctor was friendly but angry at the time but wanted to filled the prophecy so he knocked four times. ]
first time : stop the master plan to take over the universe
second time : help donna's grandfather
third time : visited all companions even know he injured from radition
four time : successfully regenerated into his eleventh incarnation with a few injuries but did as wuz predicted
Trenzalore (his final resting place), in the town of Christmas
Time Lords regenerate because they have a injury or something is wrong, it's their way of healing themselves.
The eighth Doctor regenerated offscreen and nothing is known about how or why he regenerated. The eighth Doctor appeared onscreen only once in a TV movie. We know th Time War happened between the TV movie and the start of the 2005 series. It's widely assumed that whatever the Doctor did to end the Time War caused him to regenerate.
He regenerated because his current body was getting old, so it was of natural causes.
He died of old age, pretty much. He was an elderly man to begin with, and the stress and strain of defeating the Cybermen in 'The Tenth Planet' took its toll. He collapsed in the TARDIS and in a scene that no video footage remains for, he regenerates into the Second Doctor.
Trenzalore (his final resting place), in the town of Christmas
If the Doctor regenerates then the T.A.R.D.I.S regenerates. If the T.A.R.D.I.S blows up or something, then the Doctor will die. It basically has a part of him made in it.
Eleventh Doctor was created in 2010.
He'll regenerate into the 13th Doctor.
The eleventh Doctor is Matt Smith.
He will regenerate into the 12th Doctor.
Matt Smith is the eleventh Doctor.
Matt Smith.
The fourth Doctor fell off a bridge.
Eventually yes, he will regenerate into the twelfth Doctor.
the 50th anniversary special
Doctor Who The Doctors Revisited - 2013 The Eleventh Doctor 1-11 is rated/received certificates of: UK:U