On screen
Cast
28 credited performers
Jon Pertwee
The Doctor
Katy Manning
Jo Grant
Nicholas Courtney
Brigadier Lethbridge-Stewart
Richard Franklin
Captain Mike Yates
John Levene
Sergeant Benton
Roger Delgado
The Master
Pik-Sen Lim
Captain Chin Lee
Artwork unavailable
Raymond Westwell
Prison Governor
Michael Sheard
Dr. Roland Summers
Artwork unavailable
Simon Lack
Professor Kettering
Artwork unavailable
Fernanda Marlowe
Corporal Bell
Neil McCarthy
George Patrick Barnham
Artwork unavailable
Clive Scott
Arthur Linwood
Roy Purcell
Chief Prison Officer Powers
Artwork unavailable
Eric Mason
Senior Prison Officer Green
Artwork unavailable
Bill Matthews
Prison Officer
Artwork unavailable
Barry Wade
Prison Officer
Artwork unavailable
Dave Carter
Prison Officer
Artwork unavailable
Martin Gordon
Prison Officer
William Marlowe
Mailer
Artwork unavailable
Hayden Jones
Vosper
Kristopher Kum
Fu Peng
Tommy Duggan
Senator Alcott
David Calderisi
Charlie
Patrick Godfrey
Major Cosworth
Artwork unavailable
Johnny Barrs
Fuller
Artwork unavailable
Matthew Walters
Main Gates Prisoner
Timothy Combe
Prisoner (uncredited)