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With the Doctor out of action, it is up to Polly, Ben and Barclay to stop Cutler using the Z-Bomb and devastating half the world.
The Doctor's warnings are ignored and the Cybermen take over the base, hampering the crew's efforts to help Zeus IV.
The Cybermen take over the base again, apparently to stop the humans using the Z-Bomb, but then the Doctor realises they intend to use it themselves to destroy Earth.