The TARDIS narrowly avoids becoming engulfed in a cobwebby substance in space. It arrives in the London Underground railway system, the tunnels of which are being overrun by the web and by the Great Intelligence's robot Yeti. The time travellers learn this crisis was precipitated when Professor Travers, whom they first met in the Himalayas some thirty years earlier, accidentally caused one of the Yeti to be reactivated, opening the way for the Intelligence to invade again.
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Character: The Doctor
Character: Jamie McCrimmon
Character: Victoria Waterfield
Character: Colonel Lethbridge-Stewart
Character: Professor Travers
Character: Anne Travers
Character: Harold Chorley
Character: Captain Knight
Character: Staff Sgt. Arnold
Character: Corporal Blake
Character: Corporal Lane
Character: Craftsman Weams
Character: Driver Evans
Character: Soldier
Character: Soldier
Character: Yeti
Character: Yeti
Character: Yeti
Character: Yeti
Character: Yeti
Character: Yeti