The Doctor and Romana learn the second segment of the Key to Time is on the planet Calufrax. Yet they arrive on a planet called Zanak, which has been hollowed out and fitted with hyperspace engines, allowing its insane, half-robot Captain to materialise it around smaller planets and plunder their resources.
Tom Baker | The Doctor |
Mary Tamm | Romana |
John Leeson | K-9 (voice) |
Bruce Purchase | The Pirate Captain |
Andrew Robertson | Mr. Fibuli |
Rosalind Lloyd | Nurse |
David Warwick | Kimus |
David Sibley | Pralix |
Ralph Michael | Balaton |
Primi Townsend | Mula |