The second book of the Mechanoid Invasion trilogy did not contain complete rules of play, unlike the first and third books. Summarized from the plot description on page 28: The planet Gideon E is now uninhabitable, destroyed by the Mechanoids. Descendants of the survivors are now stowaways on the Mechanoid mother ship, fighting a guerrilla war and hoping to find other survivors in the ship's labyrinthian tunnel system.