Synopsis: At the request of the Ministry, the Doctor investigates a new solar power station in Wales called Station 40. The station's director, Sir Nigel Lomax, refuses to acknowledge the potential danger of the project and appears to be working to his own agenda. The Doctor discovers that some years ago, Lomax apparently escaped death in a volcano by making contact with an alien life-form that requires intense heat to survive. Attempting to recreate a new habitat for his alien masters, Sir Nigel intends to put a permanent end to the Doctor's interfering.
Synopsis: The Doctor, John and Gillian meet an animal collector who has lost a valuable bird called a Didus. The Doctor agrees to find the bird for the collector and the three travellers set off into the jungle. There, they encounter a hostile tribe who have captured the Didus believing it to be a lucky mascot.