The Undisputed Dr. Fizz

It's a story as old as time. Boy likes girl. Girl will only date...a superhero. And unfortunately for Dave Murphy, Grand City is chock full of superheroes. In fact, in Grand City, ANYONE can be a superhero, which gives Dave an idea... The plan was simple:
1) Pretend to be a hero and save the girl from a fake mugging.
2) Live happily ever after. The plan was foolproof; nothing could possibly go wrong, even with Dave choosing his temporary superhero name from an empty, discarded soda can. The one named after a retired superhero...who finds out someone is impersonating him...soiling his good name. Now Dave has to be the hero and get the girl before the real hero comes to town and breaks his legs. See, a story old as time...