1. Multiverse Paradoxes
This is number one, because if mishandled it could end the world. It is 2012 after all. To put it in plain English, once an actor has been cast in a superhero movie he/she CANNOT be cast again in another superhero movie. It creates a multiverse paradox. I don't care if its Marvel, DC, Image, or whatever. We've all seen the
crossovers. What happens if these characters meet? It breaks the space-time continuum. Cats and dogs living together! Mass hysteria! How can the Human Torch also be Steve Rogers (Chris Evans)? Are you telling me that Cyclops is secretly married to Lois Lane (James Marsden)? Invisible Woman lives in Sin City (Jessica Alba)? A young Magneto is also warring with Jonah Hex (Michael Fassbender)? My head hurts. And the biggest superhero whore of them all. Mr. Ryan Reynolds. He is Hannibal King (
Blade Trinity), Deadpool/Weapon XI (
X-Men Origins: Wolverine), and Hal Jordan (
The Green Lantern). Ouch, that's a tough task to pick a winner out of those three movies ... Well, at least he had Scarlett Johansson on his arm for a few years. She's got super powers. Two of them. 'Nuff said.