The Visitors take the publishers of a Resistance sympathetic newspaper hostage. They threaten to kill one each day until Donovan and the others surrender. Robin falls for a heroic stranger who isn't all that he seems.

London, 1985. The alien mercenary Lytton has been stranded here for nearly a year, but now he has a plan to escape. But how does it involve the Doctor's old enemies - and why are they on Earth at this point in history?