Bob Banner is a fictional character from the Marvel Comics universe, primarily known as the alter ego of the Hulk. He is a brilliant scientist named Dr. Robert Bruce Banner, who transforms into the Hulk when subjected to emotional stress or physical danger. This transformation grants him immense strength and durability, but it also complicates his life as he struggles to control the creature within. In addition to his scientific expertise, Bob Banner is often portrayed as a tragic figure, dealing with the consequences of his experiments with gamma radiation. His character explores themes of identity, inner conflict, and the duality of human nature, making him a compelling figure in the Marvel storyline.