Last week, Marvel announced that production is currently under way on Captain America: Civil War in Atlanta, while revealing the full cast list which includes almost every main cast member from Avengers: Age of Ultron, except for Chris Hemsworth's Thor and Mark Ruffalo's Hulk. For those who have seen Avengers: Age of Ultron, you'll know there are good reasons for both of these characters' exclusion in Captain America: Civil War, but, as it turns out, it seems that Mark Ruffalo may be returning as Hulk in the first Marvel Phase Three movie after all. Be warned, there will be SPOILERS for Avengers: Age of Ultron below, so if you haven't seen it yet, read on at your own risk.

Yesterday, Mark Ruffalo sent out a cryptic tweet, stating, "The Marvel family gets just a little bit bigger." The tweet included the #CivilWar hashtag and a link to the actor's Tumblr page. Ironically, the Tumblr page includes a link to the Marvel press release announcing the full cast, which didn't include him, and a brief message that stated, "Welcome to the wild party! Looking forward to this amazing cast." Of course, he never comes out and says that he has been cast, and it's possible that he only meant he's looking forward to seeing this "amazing cast" in action when Captain America: Civil War hits theaters, but we're not quite sure at this point.

Avengers: Age of Ultron ended with Hulk literally sending himself away in the Quinjet, since he believes he is still a threat to the world, after his hulk-out in Johannesburg. It's never clear where exactly Hulk is going, but if it's true that he comes back for Captain America: Civil War, than this sequel will be even bigger than ever. Take a look at Mark Ruffalo's tweet below, and let us know whether or not you think the Hulk will show up in Captain America: Civil War.