Ηθοποιοί επεισοδίου
Jon PertweeThe Doctor
Katy ManningJo Grant
Roger DelgadoThe Master
Nicholas CourtneyThe Brigadier
Richard FranklinCaptain Mike Yates
John LeveneSgt. Benton
★
Nicholas PennellWinton
★
John RinghamAshe
Roy SkeltonNorton
Helen WorthMary Ashe
★
Pat GormanPrimitive and Voice
★
John Scott MartinRobot
Bernard KayCaldwell
Morris PerryDent