Hurled from her ancient orbit by a nuclear holocaust, the Moon had become an interstellar wanderer. In their search for a new home planet, the personnel of Moon Base Alpha must now explore every possibility no matter how bizarre or dangerous it might appear.

When the red planet glowed on the black velvet pad of Main Mission's big scanner, their hopes were raised again. But as approach and reconnaissance procedures were begun, three alien ships in tight formation streaked into view - bringing a message of doom from their mothership, a mobile arsenal capable of blasting the entire Moon to dust...

Novelization of the season 1 episodes "War Games", "The Troubled Spirit", "The Last Enemy" and "Space Brain".

Released in the U.K. in 1975 and in the U.S. in 1976.