A sci-fi game about invasion by evil aliens with robotic bodies. This introduced the basic Palladium RPG system¸ later used byPalladium Fantasyand a number of other games. It uses random-roll attributes and class-based character creation¸ with advancement based on levels. Action resolution is by d20 (combat and saving throws) or d100 (skills)¸ similar to AD&D. - A description from https://darkshire.net/jhkim/rpg/encyclopedia/ with kind permission of John H. Kim