After the TARDIS collides with a spacecraft delivering human tributes to the evil bull-like Nimon, the Doctor and Romana must stop the fearsome alien's quest to rule the galaxy.
Tom Baker
Lalla Ward
David Brierly
Graham Crowden
Michael Osborne
Bob Hornery
Malcolm Terris
Clifford Norgate
Robin Sherringham
Bob Appleby
Trevor St. John Hacker
Janet Ellis
Simon Gipps-Kent
John Bailey