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