Hulk

American theoretical physicist, famed for his work in the fields of gamma radiation
Recruited by General Ross & the U.S. Army to develop the first Gamma Bomb
Bombarded with gamma rays while saving Rick Jones, during a live test;
Transformed into a near mindless monster when under stress or angry;
Initially gray but, as the gamma radiation raged through his body, he turned green
Went on the run, traveled the country looking for a cure
Occasionally joined other heroes, founding member of the Avengers
Sent to the planet Sakaar by the Illuminati, returned to Earth after his wife died