The Earth has been invaded by the Legion, an army of extraterrestrial, shape-changing robots bent on galactic domination! They are opposed by the Global Defense Corps, brave humans who sacrifice themselves each and every day to preserve humanity - but they are not alone. You are a member of the Alliance, a valiant cadre of exiled robots who once fought them and lost. Now, you must muster every resource at your disposal to rise up once again and drive out the invaders and end the scourge of Legion once and for all! Utilizing the core True20 game system, Mechagenesis features rules for creating giant, transforming robots, as well as designing futuristic weapons, vehicle combat (naturally!), and special technology-based powers.