The TARDIS arrives in 2070 on the Moon, where a weather control station under the command of a man named Hobson is in the grip of a plague epidemic — in reality the result of an alien poison planted by the Cybermen. Jamie is knocked unconscious and lapses into a delirium, leaving the Second Doctor, Ben, and Polly to fight off a massive Cyberman attack.
Michael Craze
Ben JacksonAnneke Wills
PollyFrazer Hines
Jamie McCrimmonPatrick Barr
HobsonPatrick Troughton
The DoctorPeter Hawkins
Cyberman VoicesAndré Maranne
BenoitAlan Rowe
Voice from Space Patrol/Dr. Evans