20th Century Fox still retains control of two major Marvel franchises - the X-Men, and the Fantastic Four. So, could characters from both interact on screen one day?
Comic writer Mark Millar, who serves as "creative consultant" over Marvel's projects at Fox, tells SFX it's not just possible - but likely:
"Without question I think you have to see some of these guys showing up in each other's movies. I think the most exciting thing in superhero movies, until The Avengers came along, was when Nick Fury showed up in Iron Man. Even though it was a guy with an eye patch it was really cool – and I expect we will see more of that."
The next film in each franchise is "X-Men: Days of Future Past" in May 2014, and the "Fantastic Four" reboot in March 2015.