"Long way from home, Martha. Half a universe away."

In a distant galaxy, a spaceship hurtles out of control towards a boiling sun with the Doctor and Martha trapped on board, as Russell T Davies's Doctor Who continues. They've only got 42 minutes to uncover the saboteurs, but, with a mysterious force starting to possess the ship's crew, the Doctor is running out of time.

David Tennant plays the Doctor and Freema Agyeman plays his companion, Martha Jones. Michelle Collins guest stars.