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
as The Doctor

Mary Tamm
as Romana

John Leeson
as K-9 (voice)

Bruce Purchase
as The Pirate Captain

Andrew Robertson
as Mr. Fibuli

Rosalind Lloyd
as Nurse

David Warwick
as Kimus

David Sibley
as Pralix

Ralph Michael
as Balaton

Primi Townsend
as Mula
CinemaSerf
In this four part story, Tom Baker and his slightly superior companion "Romana" (Mary Tamm) are caught up in a time distortion that sees them arrive on a planet that's in the wrong place and controlled by the menacing "Captain" (Bruce Purchase). He rules with a rod of iron aided by his robotic falco...