 The UMAs begin merging with humans in order to search for the treasures of Mu, the powerful OOPArts, which will give them the power to revive Mu.After Geo and Omega-Xis encounter several unusual enemies, they meet a professor named Doctor Vega who sends them on a quest to find the OOPArts and stop the UMAs.Using the OOPArts, Mega Man is able to take new forms, primarily the sword-wielding Thunder Zerker form.