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Tom Baker
The Doctor / Meglos

Lalla Ward
Romana II

John Leeson
K9 (voice)

Bill Fraser
General Grugger

Frederick Treves
Lieutenant Brotadac

Edward Underdown
Zastor

Jacqueline Hill
Lexa

Colette Gleeson
Caris

Crawford Logan
Deedrix / Meglos (voice) (uncredited)

Christopher Owen
Earthling

Simon Shaw
Tigellan Guard