The Doctor
Jon Pertwee
Jo Grant
Katy Manning
Corporal Bell
Fernanda Marlowe
George Patrick Barnham
Neil McCarthy
Arthur Linwood
Clive Scott
Chief Prison Officer Powers
Roy Purcell
Senior Prison Officer Green
Eric Mason
Prison Officer
Bill Matthews
Barry Wade
Dave Carter
Martin Gordon
Mailer
William Marlowe
Brigadier Lethbridge-Stewart
Nicholas Courtney
Vosper
Hayden Jones
Fu Peng
Kristopher Kum
Senator Alcott
Tommy Duggan
Charlie
David Calderisi
Major Cosworth
Patrick Godfrey
Fuller
Johnny Barrs
Main Gates Prisoner
Matthew Walters
Prisoner (uncredited)
Timothy Combe
Captain Mike Yates
Richard Franklin
Sergeant Benton
John Levene
The Master
Roger Delgado
Captain Chin Lee
Pik-Sen Lim
Prison Governor
Raymond Westwell
Dr. Roland Summers
Michael Sheard
Professor Kettering
Simon Lack
Music
Dudley Simpson
Producer
Barry Letts
Script Editor
Terrance Dicks
Writer
Don Houghton
Director
Makeup Artist
Jan Harrison Shell
Editor
Roger Harvey
Costume Design
Bobi Bartlett
Sam Upton
Lighting Director
Eric Monk
Production Design
Ray London
Visual Effects
Jim Ward
Howard Billingham
Sound
Chick Anthony
Camera Operator
Fred Hamilton
Max Samett