10 Most Exciting New Additions To The MCU

10. Sylvester Stallone As ???

Sylvester Stallone's involvement in Guardians of the Galaxy Vol. 2 has long been rumored ever since he was spotted near the filming location with a script in hand. James Gunn has remained silent on the issue for some time, but during this year's Comic Con he released footage of the Italian Stallion showing up in the cosmic sequel.

The last time Stallone appeared in a comic book movie it resulted in Judge Dredd, so it didn't seem likely that he'd be returning to the genre anytime soon. But that's part of the joy of how big the MCU has gotten; they can get actors you'd never imagine you'd see in a Marvel movie. And they can fix people's perceptions of wronged actors.

It's still unclear what role Stallone will have in the film, though Gunn has confirmed that it's not a huge part but an important one. There have been rumors that he'll be a member of the Ravagers, but knowing Gunn's love of deep-cut references, he'll likely appearing as some obscure comic book character that will make die hard fans squeal.