The Absorbing Man is a dangerous enemy of the Hulk. He has the ability to take the properties of an object and use this to his advantage. This ability lets him also absorb the powers of the Hulk himself. Kicking Hulk's butt with his new abilities.
He even gained the ability at some point to absorb peoples minds thus gaining control of his victim. But after defeating the Hulk in battle he was tricked into absorbing a dead man's mind but being his being dead somehow caused a physical reaction briefly killing the Absorbing Man.
The Absorbing Man has defeated the mighty Thor on many occasions.
Carl Creel was a boxer who was giving a liquid of gamma radiation from Loki, transforming into Absorbing Man.