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