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

The Thirteenth Doctor's journey comes to a close not in the TARDIS, but atop a scenic cliff overlooking a sunrise.

: 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...

: Tegan Jovanka (Janet Fielding) and Ace (Sophie Aldred) take center stage, helping UNIT's Kate Stewart defend Earth. The Thirteenth Doctor's journey comes to a close

True to its status as a centenary special, the episode is packed with : Mel Bush (Bonnie Langford)

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