Ηθοποιοί επεισοδίου
Jon PertweeThe Doctor
Katy ManningJo Grant
Roger DelgadoThe Master
Nicholas CourtneyThe Brigadier
Richard FranklinCaptain Mike Yates
John LeveneSgt. Benton
Pik-Sen LimCaptain Chin Lee
★
Raymond WestwellPrison Governor
Michael SheardDr. Summers
★
Simon LackProfessor Kettering
★
Fernanda MarloweCorporal Bell
★
Clive ScottLinwood
Roy PurcellChief Prison Officer Powers
★
Bill MatthewsPrison Officer