The Hulk is a fictional character in the Marvel Comics Universe. Created by Stan Lee and Jack Kirby, the character first appeared in The Incredible Hulk #1 (May 1962). The Hulk is cast as the emotional and impulsive alter ego of the withdrawn and reserved physicist Dr. Robert Bruce Banner. The Hulk appears shortly after Banner is accidentally exposed to the blast of a test detonation of a gamma bomb he invented. Subsequently, Banner will involuntarily transform into the Hulk, depicted as a giant, raging, humanoid monster, leading to extreme complications in Banner's life. Lee said the Hulk's creation was inspired by a combination of Dr. Jekyll and Mr. Hyde and Frankenstein.
Although the Hulk's coloration has varied throughout the character's publication history, the most consistent shade is green. As the Hulk, Banner is capable of significant feats of strength, the magnitude of which increase in direct proportion to the character's anger. As the character himself puts it, "The madder Hulk gets, the stronger Hulk gets!" Strong emotions such as anger, terror and grief are also triggers for forcing Banner's transformation into the Hulk. A common storyline is the pursuit of both Banner and the Hulk by the U.S. armed forces, because of all the destruction that he causes.