Doctor Who: Slipback

This is a radio play broadcast on Radio 4 for Pirate Radio 4Odd events are taking place as the TARDIS materialises on board a space-craft: a mysterious killer stalks the ship's ducting; two dubious policemen are investigating the theft of art treasures; and the computer has taken on its own distinctive personality. Soon the Doctor stumbles on a shocking secret, a secret upon which depends the fate of the entire universe...