New 'Doctor Who' Trailer Teases Peter Capaldi's Emotional Final Moments

A new trailer for the upcoming “Doctor Who ” Christmas special reveals what may be Peter Capaldi ’s final moments inside the TARDIS.

The short clip from the upcoming episode “Twice Upon A Time” shows Capaldi as the 12th Doctor, David Bradley as the First Doctor and Pearl Mackie returning as companion Bill. But it also features a sneak peek of the moment everyone’s waiting for: The Doctor’s regeneration. 

If the regeneration follows the usual pattern, this moment will be followed by the highly-anticipated first appearance of Jodie Whittaker as the 13th Doctor . She will be the first female Doctor in the show’s 54-year history. 

“Doctor Who” will air on Christmas in both Britain and the United States, and will be shown in U.S. theaters on Dec. 27. 

Last year, the BBC released a supercut showing every “Doctor Who” regeneration: