Guest Stars Peter Hawkins voices Cyberman Roy Skelton voices Cyberman Robert Beatty as General Cutler Steve Plytas as Wigner Dudley Jones as Dyson David Dodimead as Barclay Christopher Matthews as Radar Technician Ellen Cullen as Geneva Technician Callen Angelo as Terry Cutler Christopher Dunham as R / T Technician Gregg Palmer as Gern Harry Brooks as Krang Reg Whitehead as Jarl Uncredited Patrick Troughton as The Second Doctor
