The Doctor breaks the TARDIS free from a web-like substance in space and lands in a London Underground station. The Doctor is amazed to discover that Yetis are in the tunnels and disturbed to also find a poisonous web of expanding fungus.
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Episode 1
The TARDIS lands in the London Underground which is deserted. Jamie and Victoria are captured by the military. The Doctor is amazed to discover that Yetis are in the tunnels.
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Episode 2
The deadly web continues to advance in the tunnels of the Underground. Professor Travers realises that the Doctor is the only man who can help bring an end to the Yeti menace.
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Episode 3
Episode 3 has been reconstructed frame by frame and the original audio. The Doctor meets Colonel Lethbridge-Stewart who takes control of the military operation against the Yeti. But the Doctor suspects that there is a traitor in their midst.
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Episode 4
The Doctor acquires a sample of the web, but when he, Jamie and Victoria return to HQ to examine it, they discover that Professor Travers has been abducted by the Yeti!
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Episode 5
Using Travers's body, the Great Intelligence demands that the Doctor allow his mind to be drained. Victoria is taken hostage and the Doctor has just 20 minutes to decide her fate.
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Episode 6
HQ is destroyed by the web and everyone is captured by the Yeti. The traitor is revealed and all is lost as the Doctor submits himself to the Great Intelligence's mind drain.
