Guest Stars Peter Hawkins voices Cyberman Roy Skelton voices Cyberman Steve Plytas as Wigner Robert Beatty as General Cutler 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 Harry Brooks as Krang Reg Whitehead as Jarl Gregg Palmer as Gern Uncredited Patrick Troughton as The Second Doctor
