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