The story of Mega Man & Bass vary slightly depending on which player character is chosen . It begin One year after Megaman 8 when a robot villain named King break into Dr. Wily 's laboratory and then the Robot Museum to collect the data blueprints for the creations of Dr. Light . Dr. Light alert the hero Mega Man that he must go at once to the Robot Museum to confront this new enemy . Meanwhile , Bass ( Mega Man 's rival and Wily 's greatest creation ) hears of the new criminal 's appearance and decide to prove himself the stronger robot by defeating King . Proto Man is the first to arrive at the scene . King divulge his plan to him ; he desire to create a utopia in which robots rule the world over humans . To accomplish this , King seek to create an unstoppable army using the data and invite Proto Man to join him . Proto Man refuse and attempt to attack , but King counters and slice his body in half . Proto Man then teleports back to the lab for repairs while King escapes with the data , instructing his minions to handle the heroes . With their own motivations , Mega Man and Bass set out to put a stop to King 's plans .