Doctor.who.2005.s00e161.the.power.of.the.doctor... Direct

: 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.

: In a first for the series, the Doctor regenerates back into a familiar face— David Tennant , returning as the Fourteenth Doctor —setting the stage for the 60th-anniversary specials. Doctor.Who.2005.S00E161.The.Power.of.the.Doctor...

: Disguised as Rasputin in 1916 Russia , the Master seeks to erase the Doctor from history by forcing her to regenerate into himself. : While the Master manipulates the Doctor’s timeline,

Farewell to the Thirteenth Doctor: A Look Back at "The Power of the Doctor" Farewell to the Thirteenth Doctor: A Look Back

: 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" .

: In a psychic liminal space, the Thirteenth Doctor meets versions of her former selves, including the First, Fifth, Sixth, Seventh, and Eighth Doctors .