The Hulk is a popular superhero in Marvel Comics. He was created by Stan Lee and Jack Kirby. There has been lots and lots of stuff made about this character, including a television show and a few movies.
The Hulk is the alter-ego of Bruce Banner, a mild-mannered scientist. One day when Bruce was working he was exposed to Gamma radiation. When he gets mad, he turns into the Hulk. The Hulk is big and green skinned. When he turns into the Hulk all his clothes except his purple shorts rip off. The Hulk has really really strong strength and is almost invincible.
Hulk (Marvel Comics) Facts for Kids. Kiddle Encyclopedia.