The Doctor and Sarah Jane become convinced Think Tank are behind the electronic component thefts but are unable to stop them carrying out another raid.
Quest roles:
Nicholas Courtney(Brig. Lethbridge-Stewart), Michael Kilgarriff(Cyberman Controller), John Levene(Sergeant Benton), Edward Burnham(Professor Kettlewell), Alec Linstead(Jellicoe), Timothy Craven(Short), Patricia Maynard(Miss Winters)