The episode concludes a two-part story that began in "Bad Wolf." The Doctor, Rose Tyler, and Captain Jack Harkness are trapped on Satellite 5 (the Game Station) in the year 200,100. They discover that the human race has been secretly manipulated for centuries by the Daleks, who survived the Time War by harvesting human corpses to rebuild their race. Key Plot Points
: A war-torn survivor forced to choose between genocide and cowardice. [S1E13] The Parting of the Ways
: The cellular damage from the Vortex triggers a regeneration. In his final moments, the Ninth Doctor tells Rose she was "fantastic" before transforming into the Tenth Doctor (David Tennant). Essential Characters The episode concludes a two-part story that began
: The Daleks, led by the Dalek Emperor, launch a massive invasion of Earth. The Doctor builds a "Delta Wave" transmitter that can destroy every Dalek in the vicinity, but using it will also incinerate all life on Earth. : The cellular damage from the Vortex triggers
: The companion whose determination leads her to become the "Bad Wolf".