"I think what's cool about the Planet Hulk story is it's all Hulk. He's a gladiator, he's fighting all these creatures on another world. Yes, some of those creatures show up in [Guardians of the Galaxy], which makes people think, 'Oh, maybe it could exist.' And maybe it could exist, someday. I don't think that's the first place we would go though for the very reason that you stated, which is, if we were ever able to do a standalone Hulk movie, 60 percent of the fun would be seeing Mark Ruffalo leading a Marvel movie -- and that's what we would do if we ever went down that road."
- Kevin Feige