Doctor Who: The Pirate Planet (Part 4)

"The Pirate Planet (Part Four)" is the eighth episode of of the sixteenth series of the original British science fiction television programme, Doctor Who. It is the 492nd episode of the show overall and the second chapter in the "The Pirate Planet" storyline and features Tom Baker as the Fourth Doctor. It was directed by Michael Hayes with a script written by David Fisher. This episode aired on BBC One on Saturday, October 21st, 1978.