Proto Man, Mega Man's "brother," becomes the prime suspect of an attack involving eight robot masters. It's now up to Mega Man to get to the bottom of the Proto Man's sudden aggression.Proto Man, Mega Man's "brother," becomes the prime suspect of an attack involving eight robot masters. It's now up to Mega Man to get to the bottom of the Proto Man's sudden aggression.Proto Man, Mega Man's "brother," becomes the prime suspect of an attack involving eight robot masters. It's now up to Mega Man to get to the bottom of the Proto Man's sudden aggression.