In the third episode of the four-part story "The Pirate Planet," the Doctor (Tom Baker) is unable to recover the second segment of the Key to Time, thanks to the villainy of an interplanetary pirate captain (Bruce Purchase). From his subterranean headquarters on the planet Zanak, the captain is able to pilot the planet throughout space, sucking the life forces from other planets all along the way. Could all this have something to do with the still-unseen Black Guardian, who is determined to prevent the Doctor from reassembling the Key to Time, thereby restoring the balance between Good and Evil? Written by Douglas Adams, "The Pirate Planet, Episode 3" first aired on October 14, 1978. ~ Hal Erickson, Rovi