The Stuff of Nightmares

After narrowly escaping The Year That Never Was, Martha and the Doctor have decided to take some much-needed 'time off'. Despite their victory, however, all is not well. Martha returns to the TARDIS haunted by her experience by the Cybermen, and, despite the Doctor's assurances, with the niggling doubt that the Doctor may not have gotten away from the Cybermen entirely unscathed.