Guest Stars Roy Skelton voices Cyberman Peter Hawkins 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 Gregg Palmer as Gern Reg Whitehead as Jarl Harry Brooks as Krang Uncredited Patrick Troughton as The Second Doctor
