9. Fantastic 4
Imagine a sandbox game with four different heroes, all switchable at any time defending or exploring one huge location, (again, it'll have to be a city, but home is where the heart is i guess) now each member of the 4 have their own powers and abilities, imagine the ways you could combine these powers while you go around doing your own thing! Destructible environments? Thing's got your back, Fleeing Criminals? Reach out with Mr Fantastic, maybe you need to sneak into enemy territory for one of the missions? Invisible Woman is your gal. And finally just because it would be worth the ticket price alone, "Flame On" with Human Torch as you dart through the skies above the city. RPG elements for each character maybe? Maybe special moves or puzzles that see you combining the different powers of the four? Hook this all together and you've got yourselves a deal.