What would have happened if the Doctor had died facing the Racnoss? We find a nightmare world as Donna and Rose attempt to stop the approaching Darkness.
David Tennant only makes a small contribution to this “Doctor-lite” episode as the Tenth Doctor. The story instead focuses on the Doctor’s companion, Donna Noble (Catherine Tate) and her encounters with former companion Rose Tyler (Billie Piper). The episode’s narrative focuses on an alternate history where the Doctor dies during the events of the 2006 Christmas special “The Runaway Bride”. The episode depicts a dystopia caused by the Doctor’s death, leaving Rose to convince Donna to save the world. The beginning and end of the episode take place in the show’s normal continuity, and features a cliffhanger that leads directly into the series finale “The Stolen Earth”.
Davies’ writing and Tate’s performance were acclaimed, and the episode was praised for its depiction of dystopia in a scene, characterised by the internment of a foreign citizen.