Matt Smith, who played the Eleventh Doctor until he regenerated in the Time of the Doctor, has spoken about his regeneration sequence.
During the WonderCon Q&A, Smith said:
“It’s very interesting the Christmas episode and particularly the regeneration. We shot so many versions of that.”
“We shot much more brutal, emotional and troubling takes and stories in there. The actual take that is used is an interesting one for me.”
Smith admitted he would have preferred one of the alternative takes:
“To be honest, although it’s still a great episode, I think perhaps of what we shot and what was cut I would have chosen differently.”
Though there were no details on what the different versions involved, original reports suggest that in one take the 11th Doctor lost a leg.