Air: March 13 1971. 4 eps.
A UFO has landed in England bringing seemingly friendly aliens called The Axons, they have come providing an energy source called axonite which is promised to solve all the earth’s problems. But The Doctor later discovers that The Master has conspired with Axos, which are really space vampires who intend to drain the life out of the entire world. Can The Doctor and The Master form an unlikely allience to stop these devils in disguise?