Back in July, BBC unveiled a new look at the Doctor Who Christmas Special, with the Christmas Special trailer revealing that the current and departing Time Lord, played by Peter Capaldi, will get to meet the very first Doctor, played by the legendary David Bradley. Today BBC released the first clip from the Christmas Special, featuring a scene where David Bradley's First Doctor steps into the technologically-advanced Tardis of the current Doctor. The scene also features another look at a character known only as The Captain, portrayed by longtime Doctor Who writer and actor Mark Gatiss.

The clip opens with the First Doctor, feeling quite cocky, about to introduce the current Time Lord and The Captain to his Tardis, when he realizes that it isn't actually his Tardis. Peter Capaldi's Time Lord points out on a monitor that the First Doctor's Tardis is about 70 feet in the other direction, while we learn some interesting details about The Captain. When The Captain asks if he's "going mad," Peter Capaldi points out that he's a "World War I officer at the South Pole being pursued by an alien through frozen time." The Time Lord's statement throws him for a loop, since this character, naturally, isn't even aware that there was a second World War.

The preview ends with the current Time Lord revealing to the first Doctor that they're really the same person, which confuses the first Doctor who states that he thought he'd get "younger," which naturally upsets Capaldi's Time Lord, who responds vehemently, "I am younger!" With just over a month left until this special, entitled Twice Upon a Time, debuts on Christmas Day, it isn't known how much more footage will be revealed. This will mark the final Doctor Who appearance for Peter Capaldi, whose Time Lord will have a history-making regeneration at the end of the episode.

Related: Doctor Who Season 11 Premiere Date Announced, Big Change Revealed

The BBC announced in July that Jodie Whitaker is the 13th Doctor, making her the first ever woman to take on the iconic title role. Fans will get a first look at Jodie Whitaker at the end of the Christmas Special, before Season 11 debuts next fall, with a brand new cast. The Christmas Special will also bring back Pearl Mackie as Bill Potts, although viewers will have to wait until Christmas to discover exactly how Bill, who will appear throughout the episode, makes her return. Pearl Mackie will not be returning for Season 11, but there is already a new Doctor Who cast in place.

BBC announced last month that the new Doctor Who cast surrounding Jodie Whitaker will be Bradley Walsh as Graham, rumored to be the new companion of Jodie Whitaker's Time Lord, Tosin Cole as Ryan and Mandip Gill as Yasmin, with Sharon D. Clarke coming aboard for an unspecified recurring role. Longtime head writer Steven Moffat is also leaving the show after this season, with Chris Chibnall, who put together this new cast, taking his place. Doctor Who Season 11 will be comprised of 10 50-minute episodes, with the season set to premiere this fall on BBC and BBC America. Take a look at this new clip from the Doctor Who Christmas Special, courtesy of BBC YouTube.