After a nap Dr. Willy remembers an invention that he had forgotten over the years, the 'Double Gear System'. This is an invention from his days in college that endows robots with capabilities beyond their limits. So he decides to kidnap eight Robot Masters and implant his invention into them to fight
Mega Man
Also, it seems Capcom right about being able to clear the game without using the Double Gear system. I was able to beat around half the stages in this game without touching it once, its inclusion is handled wonderfully.
And I've heard them all. https://youtu.be/ObHBrR4RQqE