All Cast
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