Guest Stars Gordon St Clair as Cyberman Peter Hawkins voices Cyberman Roy Skelton voices Cyberman Jerry Holmes as Cyberman Donald Sumpter as Enrico Casali Clare Jenkins as Tanya Lernov Eric Flynn as Leo Ryan Michael Turner as Jarvis Bennett James Mellor as Sean Flannigan Derrick Gilbert as Armand Vallance Anne Ridler as Dr. Gemma Corwyn Michael Goldie as Elton Laleham Peter Laird as Chang Kenneth Watson as Bill Duggan
