The Story of Bruce Banner/Hulk (Marvel Cinematic Universe)

Chitauri Invasion: Initiation by Black Widow

One evening, Banner was approached by a girl that claimed her parents were very ill. He followed her to her home on the outskirts of the city where she made a quick escape. Banner remarks to himself that he should have been paid upfront. To his surprise, he was approached by Natasha Romanoff. Banner asked Romanoff did she was sent there to kill him, to which she assured him that she was sent by S.H.I.E.L.D. Suspicious, Banner suggested that the building was already surrounded.

Natasha revealed that S.H.I.E.L.D. had been assisted Bruce in his hiding; keeping their distance and derailing parties interested in capturing Hulk. She divulged that S.H.I.E.L.D. was facing a potential global catastrophe, events that Banner claimed to actively avoid. Banner is shown an image of the Tesseract, to which he questioned if Nick Fury wanted him to swallow it. Romanoff claimed that Fury needs his help finding it as the object emits Gamma Radiation, Banner's specialty.

Banner remained doubtful of S.H.I.E.L.D. intentions as he suggests that S.H.I.E.L.D. needed him in a cage. He suddenly yells in a fit of rage, with Romanoff immediately draws her firearm in response. Banner takes a step back and apologizes for getting angry at her. He reveals that he wanted to see how Natasha would respond to a Hulk incident; to which she orders a surrounding S.H.I.E.L.D. task force to stand down. Banner agrees to assist S.H.I.E.L.D. in finding the Tesseract.