When Machine Boy falls into the city of Mega 416, he leaves a wake of destruction in his path... until Karate Grandpa is able to activate his heart. Now, whether he is fighting giant bugs in the school's basement or making the perfect spaghetti sauce, Machine Boy is always looking for the best way to help others. But when his heart reacts dangerously to mysterious debris from outer space, Machine Boy wonders if he can be a force for good after all.