: Disguised as Rasputin in 1916 Russia , the Master seeks to erase the Doctor from history by forcing her to regenerate into himself.
: The episode concludes with a "companion support group" featuring surprise appearances from Ian Chesterton (William Russell), Mel Bush (Bonnie Langford), and Jo Grant (Katy Manning). The End of an Era Doctor.Who.2005.S00E161.The.Power.of.the.Doctor...
Farewell to the Thirteenth Doctor: A Look Back at "The Power of the Doctor" : Disguised as Rasputin in 1916 Russia ,
: Reflecting her playful and optimistic nature, Whittaker’s final line is a simple: "Right then, Doctor whoever-I'm-about-to-be... tag, you're it" . tag, you're it"
: While the Master manipulates the Doctor’s timeline, the Daleks attempt to trigger volcanic eruptions across Earth, and a Cyberman-controlled planet threatens the globe.
The Thirteenth Doctor's journey comes to a close not in the TARDIS, but atop a scenic cliff overlooking a sunrise.
The story sees the Thirteenth Doctor and her companion (Mandip Gill) facing an unprecedented alliance between the Master (Sacha Dhawan), the Daleks , and the Cybermen .