Ηθοποιοί επεισοδίου
Jon PertweeThe Doctor
Nicholas CourtneyThe Brigadier
Caroline JohnLiz Shaw
Paul DarrowCaptain Hawkins
Geoffrey PalmerMasters
★
Richard SteeleSergeant Hart
★
Nigel JohnYoung Silurian
★
Simon CainSilurian
★
Alan MasonCorporal Nutting
★
Derek PollittPrivate Wright
★
Brendan BarryHospital Doctor
★
Pat GormanSilurian Scientist
Peter HallidaySilurians (voice)
Peter MilesDr. Lawrence