Attack of the Robo-Men!

From publisher blurb: The second adventure in the X! series - this one for the pulp sci fi rpg Space Adventures X! A thrilling tale of rocket ships, ray guns, robots, huge space monsters and evil villains across the vastness of space. This is also a sourcebook, with a new character class (Automaton) and several new aliens. Set ray guns to kill and pick this book up now!