Ηθοποιοί επεισοδίου
Jon PertweeThe Doctor
Katy ManningJo Grant
Roger DelgadoThe Master
Nicholas CourtneyThe Brigadier
Richard FranklinCaptain Mike Yates
John LeveneSgt. Benton
Michael SheardDr. Summers
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Bill MatthewsPrison Officer
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Barry WadePrison Officer
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Dave CarterPrison Officer
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Martin GordonPrison Officer
Patrick GodfreyMajor Cosworth
Neil McCarthyBarnham