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Tom Baker
The Doctor

Lalla Ward
Romana II

David Brierly
K9 (voice)

Graham Crowden
Soldeed

Michael Osborne
Sorak

Bob Hornery
Pilot

Malcolm Terris
Co-Pilot

Clifford Norgate
Nimon (voice)

Robin Sherringham
Nimon

Bob Appleby
Nimon

Trevor St. John Hacker
Nimon

Janet Ellis
Teka

Simon Gipps-Kent
Seth

John Bailey
Sezom