Hulk is a 2003 American superhero film based on the Marvel Comics character of the same name, created by Stan Lee and Jack Kirby. Produced by Universal Pictures in association with Marvel Enterprises, Valhalla Motion Pictures, and Good Machine, and distributed by Universal, it was directed by Ang Lee and written by John Turman, James Schamus, and Michael France, from a story conceived by Schamus. The film stars Eric Bana as Bruce Banner and Hulk, alongside Jennifer Connelly, Sam Elliott, Josh Lucas, and Nick Nolte. The film explores Bruce Banner's origins. After a lab accident involving gamma radiation, he transforms into a giant green-skinned humanoid with superhuman strength known as the Hulk whenever stressed or emotionally provoked. The United States military pursues him, and he clashes with his biological father, who has dark plans for his son.