Warning: This article contains discussions of depression and suicide.
Throughout the first phases of the MCU, The Hulk's biggest hurdle is his own mental health, and the Avengers completely ignore it whenever it comes up. In his only solo film, before Marvel Studios was producing all of its own movies, Bruce Banner was sequestered in Brazil, trying his best to work on his own mental health before learning to control The Hulk to a reasonable degree. He even worked with a specialist that helped him focus on his breathing at the beginning of the film. To help him control his bouts as The Hulk, Banner also wears a heart rate monitor so that he knows when to calm down before becoming the chaotic green monster. Through the end of the film, Banner learns to accept The Hulk and starts seeing him as an asset, even if he can't fully control his own mind.
The next time the Marvel audience sees Bruce Banner is during the first Avengers movie, where he is alone in another country again, this time going more than a year since his last incident as The Hulk. S.H.I.E.L.D. sends Natasha Romanoff to recruit him as part of the mission that is described as needing Bruce Banner. However, by the end of the movie, it is clear that Nick Fury wanted The Hulk. This is despite S.H.I.E.L.D. knowing that Banner had spent years of his life actively fighting against becoming The Hulk by working on himself through meditation, yoga, and low-stress environments.
Related: Every Actor Who's Played Marvel's Hulk In Live-Action
All of the mental health concerns that Bruce Banner could be facing seem to be of no consequence to Fury, as he rips him out of his safe haven so that he can help fight the looming alien threat. In fact, throughout the MCU, the
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