The Macra Terror

The Doctor, Ben, Polly and Jamie visit a colony that appears to be a happy holiday camp. However, when they scratch beneath the surface, they find that the colonists are mind controlled by the Macra, crab-like creatures, who are forcing them to mine a gas vital for their survival, but fatal to the colonists.

The Moonbase

The TARDIS lands on the Moon in 2070, where the crew are becoming infected with a strange alien virus. With Jamie unconscious, the Doctor, Ben and Polly become aware of a mysterious silver menace.