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The Doctor, Sarah Jane, and Harry return to the Nerva Beacon in a different time period than when they departed. Sarah Jane is poisoned by a metallic snake-like creature and the Doctor is forced to transmat her to a nearby planetoid, Voga, to save her life. However, the trio soon realize that they are in danger from an old foe of the Doctor's...
The Doctor: (to the Cybermen) You've no home planet, no influence, nothing! You're just a pathetic bunch of tin soldiers skulking about the galaxy in an ancient spaceship!