The Hulk is a fictional character, a superhero who appears in comic books published by Marvel Comics. Created by Stan Lee and Jack Kirby, the character first appeared in The Incredible Hulk #1 (May 1962). He is a gigantic, green, irradiated, mutated humanoid monster with incredible strength and an inability to control his rage. The Hulk is sometimes characterized as hyper-aggressive and brutal, other times as cunning, brilliant, and scheming. He is often portrayed as an antihero. The Hulk is cast as the emotional and impulsive alter ego of the withdrawn and reserved physicist Dr. Bruce Banner; Banner first transforms into the Hulk shortly after he is accidentally exposed to the blast of a test detonation of a gamma bomb he invented.