Doctor David Bruce Banner, M.D., Ph.D., is a renowned scientist and a founding member of the Avengers. Highly respected for his work in biochemistry, nuclear physics and gamma radiation, Banner was tasked by Thaddeus Ross to recreate the Super Soldier Serum that created Captain America. However, Ross elected not to inform Banner what he was creating. During the experiment, Banner substituted vita radiation for gamma radiation and administered the serum on himself. As a result, the mild-mannered scientist found that when angered, provoked or excited, his body and brain would transform into a huge, rage-fueled, primitive-minded creature known as the Hulk