Guest Stars Sonnie Willis as Cyberman Peter Greene as Cyberman Keith Goodman as Cyberman Peter Hawkins voices Cyberman John Maxim as Cyberman Reg Whitehead as Cyberman Robin Scott as Scientist Edward Phillips as Scientist Barry Ashton as Scientist Derek Calder as Scientist Arnold Chazen as Scientist Leon Maybank as Scientist Victor Pemberton as Scientist Ron Pinnell as Scientist Alan Wells as Scientist John Rolfe as Sam André Maranne as Benoit Patrick Barr as Hobson Michael Wolf as Nils Mark Heath as Scientist Ralph Debayo Alan Rowe as Dr. Evans / Space Control
