The Master's Dalek Plan

The Master's Dalek Plan was one of several titles that used for his plot to steal the Doctor's identity by forcing the Thirteenth Doctor to regenerate into him. This involved an alliance with the Daleks and the Cybermen, where they in return would have their greatest enemy erased, and be able to conquer Earth. (TV: The Power of the Doctor)

A day to come
After saving the universe from the Flux, the Thirteenth Doctor was confronted by Time, who warned her that her time was "heading to its end", to beware of the forces which massed against her, and. (TV: The Vanquishers)

Behind the scenes

 * The Master's Dalek Plan is a pun based upon the First Doctor story titled The Daleks' Master Plan. This pun had previously been used for the Big Finish War Master audio story of the same name, which sees the War Master manipulating Dalek history.