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Sarah is captured by the spiders' guards while the Doctor tries to help Arak and the others strike back against the spiders.
The Doctor and Sarah head to the meditation centre to try and get the crystal back while Lupton prepares to return it to Metebelis Three.But all their plans are disrupted when it is stolen by Tommy.
The Doctor escapes from the spiders' larder only to encounter the Great One, while Sarah makes a deal with the Queen Spider.