Dr Who: Attack of the Cybermen

Whilst narrowly avoiding a collision with Halley's Comet in the TARDIS, the Doctor and Peri encounter a distress call emanating from London, Earth in 1985. The Doctor decides to investigate. . . In central London, a gang of diamond-thieves, led by ex-Dalek agent Lytton, plan to enter their target building via the sewers. But once down in the darkness, things start going wrong, for lurking in the underground shadows are the Cybermen. . . After the Doctor and his companion Peri are captured by the Cybermen, they are caught up in a complex scheme which involves dramatically altering history, allowing the Cybermen to prevent the destruction of their first home planet Mondas. Forced to take the TARDIS to the new homeworld of the Cybermen (the ice-tombs of Telos), the Doctor realises the situation is being sinisterly manipulated but by whom? The Cybermen? Lytton? The Cryons (the original inhabitants of Telos)? Or prehaps even his own race, the Time Lords? Originally Transmitted on 5 - 12 January 1985