Tom Baker
The Doctor / Meglos
Acting
Lalla Ward
Romana II
Acting
John Leeson
K9 (voice)
Acting
Bill Fraser
General Grugger
Acting
Frederick Treves
Lieutenant Brotadac
Acting
Edward Underdown
Zastor
Acting
Jacqueline Hill
Lexa
Acting
Colette Gleeson
Caris
Acting
Crawford Logan
Deedrix / Meglos (voice) (uncredited)
Acting
Christopher Owen
Earthling
Acting
Simon Shaw
Tigellan Guard
Acting