Patrick Troughton as The Doctor

Anneke Wills as Polly

Michael Craze as Ben Jackson

Frazer Hines as Jamie McCrimmon

Patrick Barr as Hobson

André Maranne as Benoit

Michael Wolf as Nils

John Rolfe as Sam

Mark Heath as Ralph

Alan Rowe as Voice from Space Patrol/Dr. Evans

Denis McCarthy as Voice of Rinberg

Barry Ashton as Scientist

Derek Calder as Scientist

Arnold Chazen as Scientist

Leon Maybank as Scientist

Victor Pemberton as Scientist

Edward Phillips as Scientist

Ron Pinnell as Scientist

Robin Scott as Scientist

Alan Wells as Scientist

Mark Heath as Scientist

John Maxim as Cyberman

Sonnie Wills as Cyberman

Peter Greene as Cyberman

Keith Goodman as Cyberman

Reg Whitehead as Cyberman

Peter Hawkins as Cyberman Voices