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
Michael Sheard
Dr. Roland Summers
Neil McCarthy
George Patrick Barnham
William Marlowe
Mailer
Kristopher Kum
Fu Peng
Tommy Duggan
Senator Alcott
Patrick Godfrey
Major Cosworth
Raymond Westwell
Prison Governor
Simon Lack
Professor Kettering
Fernanda Marlowe
Corporal Bell
Clive Scott
Arthur Linwood
Roy Purcell
Chief Prison Officer Powers
Eric Mason
Senior Prison Officer Green
Bill Matthews
Prison Officer
Barry Wade
Prison Officer
Dave Carter
Prison Officer
Martin Gordon
Prison Officer
Hayden Jones
Vosper
David Calderisi
Charlie
Johnny Barrs
Fuller
Matthew Walters
Main Gates Prisoner
Timothy Combe
Prisoner (uncredited)