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
as The Doctor
Lalla Ward
as Romana II
David Brierly
as K9 (voice)
Graham Crowden
as Soldeed
Michael Osborne
as Sorak
Bob Hornery
as Pilot
Malcolm Terris
as Co-Pilot
Clifford Norgate
as Nimon (voice)
Robin Sherringham
as Nimon
Bob Appleby
as Nimon
Trevor St. John Hacker
as Nimon
Janet Ellis
as Teka
