The Doctor / Meglos
Tom Baker
Romana II
Lalla Ward
Tigellan Guard
Simon Shaw
K9 (voice)
John Leeson
General Grugger
Bill Fraser
Lieutenant Brotadac
Frederick Treves
Zastor
Edward Underdown
Lexa
Jacqueline Hill
Caris
Colette Gleeson
Deedrix / Meglos (voice) (uncredited)
Crawford Logan
Earthling
Christopher Owen
Writer
John Flanagan
Andrew McCulloch
Producer
John Nathan-Turner
Executive Producer
Barry Letts
Original Music Composer
Peter Howell
Director
Terence Dudley
Paddy Kingsland
Script Editor
Christopher H. Bidmead
Camera Operator
Alec Wheal
Lighting Director
Bert Postlethwaite
Production Assistant
Marilyn Gold
Editor
Ian Williams
Production Design
Philip Lindley
Sam Upton
Visual Effects
Steven Drewett
Makeup Artist
Cecile Hay-Arthur
Costume Design
June Hudson
Special Sound Effects
Dick Mills
Sound
John Holmes