Yeah I was wondering that as well. You see his head swelling making you think he's gonna change as well and then you don't see him again! Also Stan Lee ingested some of Hulk's blood. You think there's gonna be a huge mutant Stan Lee on the rampage in a future flick lol?
So do I take it by the last scene that you see Banner in that he's found a way to change into Hulk at will? That's the impression I got.
Bookmarks