Simplify the following text for a Grade 4 native English-speaking person.
Original: Dr. Wright sends Mega Man to defeat his fellow creations and put a stop to Dr. Wily . After succeeding , Mega Man returns home to his robot sister Roll and their creator Dr. Wright .
Simplified: It 's up to Mega Man , a robot created by Dr. Light , to stop Dr. Wily and his army of Robot Masters .