Bruce Banner is a mild-mannered scientist who used to work at an American University. He was approached by his girlfriend’s father, General Thaddeus Ross, to be part of a test that would develop immunity to gamma rays. Ross did not tell Banner that this test was actually an experiment to make a Super-Soldier similar but more powerful than Captain America as Captain America had been frozen for 70 years and no one knew where he was (he is uncovered just before the beginning of The Avengers). The test caused Banner to transform into the Hulk (a giant green rage monster, in the words of Tony Stark) whenever Bruce was angry or excited. After the experiment Banner ran away and became a fugitive. He was tracked down by the U.S army so that they could use him as a weapon, though their attempts were unsuccessful. Despite this, when the U.S army needed his help to take down a similar monstrosity, the Abomination (Emil Blonsky), which Banner successfully helped them. Due to his assistance, his status as a fuigitive was revoked. He resided in Bella Coola until he became part of The Avengers.