Doctor Who has released a first look at the feature-length Centenary special and Jodie Whittaker's final episode, which will air later this year.
For the first time since the show returned to BBC One in 2005, The Master, the Daleks and the Cybermen will all feature in one single story.
It also revealed the surprise return of two of the Doctor's companions from the 80s with Tegan Jovanka star Janet Fielding and Ace star Sophie Aldred reprising their roles for the first time since leaving the show.
Janet, who played Tegan from 1981 to 1984, said: "In some ways it was a very different experience to what it was like when I finished recording in 1983, but in many ways it was very similar.
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