The Time of the Doctor
The Time of the Doctor will be broadcast on December 25th, 2013, and will be Matt Smith's last episode as the 11th Doctor, and will be Peter Capaldi's second appearance in an episode as the 12th Doctor (as he was seen for a few seconds in the 50th Anniversary Special).
The Day of the Doctor
The Day of the Doctor was first broadcast on November 23rd 2013 on the 50th anniversary of the show.
It featured the 10th Doctor, the 11th Doctor and a regeneration of the Doctor that was not shown on screen (until this episode) that was supposed to have been in between the 8th and the 9th Doctor, and is therefore often referred to as Doctor 8.5.
It featured the 10th Doctor, the 11th Doctor and a regeneration of the Doctor that was not shown on screen (until this episode) that was supposed to have been in between the 8th and the 9th Doctor, and is therefore often referred to as Doctor 8.5.