Utopia (TV story)

Plot
The Doctor takes Martha to the 'end of the Universe' where Humans still live but in more barbaric conditions.

Trivia

 * Captain Jack Harkness returns in this episode.
 * in Doctor Who adventures issue 22 it mentions the Doctor and Martha "discovering" Utopia, meaning it is a place.
 * This episode may briefly show The 'Torchwood Hub'.