The Hulk is rarely portrayed as a villain in comics. That implies that he is making a conscious choice to do wrong, which he rarely does. Marvel may portray any given character as hero, villain, anti-hero, over time. Hulk has been in all of these roles at different times.
Doctor Robert Bruce Banner was a normal human scientist until he was exposed to gamma radiation which transformed him into a huge green-skinned muscular behemoth known as the Hulk. He transforms into the Hulk every time he gets angry. He is one of the first five founding heroes of the Avengers and serves as the main weapon of the team.
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