5. Fox MCU + Marvel Studios MCU
Marvel Studios is busy assembling Phase Two of their Marvel Cinematic Universe, and in the years to come, Fox is going to attempt to forge their own equivalent featuring the Fantastic Four and the X-Men, but what about if Fox and Marvel Studios could come to an agreement on these two disparate worlds coming together to form a gigantic new universe? Though working out the logistics of such an enterprise would likely give those involved more than a few headaches, the potential rewards will be very much worth it; can you imagine Wolverine, Iron Man and The Thing combining their powers to take down their biggest foe yet? Quite what sort of enemy could even measure up to this mass of power is anyone's guess, and the filmmakers would need to be careful not to overstuff the film, but if given a deft touch, there's plenty of potential here for one Hell of a movie.