The Cybermen are on the march through the Hundred Realms, killing and converting as they go. Resistance is useless.
Trapped on the outermost fringes of the battle, the Doctor and Jamie McCrimmon are astonished to encounter an old friend: astrophysicist Zoe Heriot.
It's the happiest of reunions. But what hope is there of a happy ending against the unstoppable Cybermen?
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