Captain Turner manages to rescue Jamie and the others, while the Doctor begins working on a way to protect everyone from the Cybermen's hypno-sound signal.
Quest roles:
Nicholas Courtney(Brig. Lethbridge-Stewart), Peter Hawkins(Dalek (voice)), Kevin Stoney(Tyrum), Pat Gorman(Soldier), John Levene(RSM Benton), Sally Faulkner(Isobel Watkins), Peter Halliday(Pletrac), Ian Fairbairn(Doctor Chester), Edward Burnham(Professor Kettlewell), Stacy Davies(Private Perkins), Derek Chafer(Cyberman), Terence Denville(Cyberman), Charles Finch(Cyberman), John Spradbury(Cyberman), Ralph Carrigan(Cyberman), James Thornhill(Sergeant Walters), Robert Sidaway(Captain Turner)