A Yellow Power Ring finds Dr. Wily and inducts him into the Sinestro Corps. Dr. Wily successfully completes Sinestro Corps boot camp (as of pre-Blackest Night). He returns to Earth to battle Mega Man. What happens in this fight, and what happens to Earth?
P.S. If you do not think Dr. Wily is capable of instilling fear, then read the full version of the warning left on X's capsule by the late Dr. Thomas X. Light.