In order for a hero to truly excel, they must face off against villains worth excelling against. In his thirty-year history, Mega Man and his many incarnations have faced off against a lot of bad guys, and while it's not clear if we'll get to see the Blue Bomber back in action any time soon (outside of Super Smash Bros., of course), his loyal legion of fans will have to content ourselves with looking to the past and thinking about the countless epic villains he (and his many incarnations) have faced off against. So, kick back, crack open an E-tank, and revel in your past victories and defeats as we check out the 10 Greatest Mega Man Bosses.