The TARDIS, as seen before, seems to display a mind of its own and whisks the Doctor, Donna, and the Time Lord's former companion Martha Jones to the planet Messaline, in the midst of a savage war between humans and the fish-like Hath. Martha is abducted by the Hath shortly after the time travellers arrive. Rescuing Martha becomes the Doctor and Donna's main priority, as well as attempting to put ...