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