It has been debated over and over again that the Hulk's origin while not being done in this movie has strayed from the comics. Many fanboys were angered by Lee's origin. Many thought this movie was just a super soldier serum origin. It's not. It has been said by Louis himself that while this isn't an origin movie, the Hulk was created by.......the Gamma Bomb. Oh, just in case..here it is: " You’ll see Bruce Banner transform in minute three. (Laughs) Minute three! That’s what’s good about it and it was really important when I was accepting the movie. We're not treating it as an origin movie but: Bruce Banner stepping into his chair and the gamma bomb and everything. He’s the Hulk already, with the Hulk within him, and you get to understand how he came to be in this situation, his struggle in life, the other characters surrounding him and the enemies that he deals with and fights with."