Quote Originally Posted by Zool View Post
One theory about Hulk is that he is tired of just being the hired muscle. If they had the rights to make an actual Marvel Hulk movie, they might not have had to add it into this story.
That, and in Ragnorak he believes that Earth hates him and he doesn't want to go back. Then he's forced back there and he's not willing to help out people who would rather he never come back. Hulk is really a giant child whose sulking ability can rival his strength.