This is the second expansion to Monster Island and currently is only available as an electronic document downloadable from the publisher or RPGNow.Expands: Monster Island From the publisher's website:Invasion of Monster Island, the thrilling sequel to the Origins Award-nominated Monster Island: The Game of Giant Monster Combat, features expansion rules for creating and fighting alien fleets bent on world conquest. It also contains new monster powers, new human army units and rules for battles in outer space or other planets. You must have Monster Island and Escape from Monster Island to use this expansion. - BoardGameGeek