Dr Who - 138 - Attack of the Cybermen - Synopsis
Dr Who - Colin Baker - Series 22 - ep 1 - tep 138
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The Doctor and Peri answer a distress call which brings them to the Earth of 1986, shortly prior to the Doctor destroying Mondas, the original home of the Cybermen. The Cybermen have stolen a time machine and are intent on stopping the destruction of Mondas. The Doctor is surprised to find that the mercenary Lytton is on Earth and apparently in league with the Cybermen.