Utopia (TV story)

Plot
The Doctor takes Martha to the 'end of the Universe' where Humans still live but in more barbaric conditions. Jack grabs onto the TARDIS at one point in the episode.

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.
 * The Master returns in this episode.