After some experimentation, Biff discovered that he was not, in fact, like Superman after all. He could fly, he couldn't get hurt, and he had super-strength, but that was it. No super hearing, no heat vision, no X-ray vision.
But still ... what he had wasn't bad.
He began to wonder where he was, since he didn't recognize anything. He could have been on the other side of the world, for all he knew. He had to get back home, back to something familiar.
When he thought about home, he started to think about Sarah. A smile crept into his face, as he thought about his new situation. Surely, she'd dump Jay for him now, right? How could Jay compete with a superhero?
This superhero thing was looking better and better the more he thought about it. Unfortunately, he never thought about the downsides, like having to constantly save the world.