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Bruce Banner, more commonly known by his alter ego the Hulk, is a fictional character in the Marvel Cinematic Universe (MCU) media franchise originally portrayed by Edward Norton and subsequently by Mark Ruffalo—based on the Marvel Comics character of the same name. Banner is depicted as a genius physicist who, after a failed experiment to replicate a super soldier program using gamma radiation, metamorphoses into a large, muscular humanoid creature with green skin whenever his heart rate goes above 200 beats per minute, he is angered, or when facing mortal danger. As the Hulk, he possesses superhuman abilities, including increased strength and durability.

Over time, Banner demonstrates an increasing ability to control the transformation and becomes a founding member of the Avengers. Following a conflict with Ultron, Banner is transported to Sakaar, where he remains as the Hulk for several years. After reuniting with Thor, he eventually returns to Earth during the conflict against Thanos. In the years following the Blip, Banner learns to retain the Hulk form with his mind still intact. He assists the Avengers in time travelling to obtain the Infinity Stones from the past to undo Thanos' actions. Banner uses the Stones in a specially-made Nano Gauntlet to restore the lives lost, before participating in a final and victorious battle against Thanos. He later trains his cousin Jennifer Walters who is accidentally imbued with his blood before departing again to Sakaar and meeting his son, Skaar. Banner becomes a professor of quantum mechanics and meets Peter Parker, until he's controlled by the mutant named Jean Grey, and caused him to transform back into an uncontrollable Hulk.

Banner has become a central character within the MCU, having appeared in ten films as of 2026, as well as the Disney+ streaming series She-Hulk: Attorney at Law. The character was introduced in the titular film The Incredible Hulk (2008), portrayed by Edward Norton before being recast to Mark Ruffalo. The character has been generally well-received by critics and audiences alike, but his inconsistent characterization has received some criticism. Additionally, Ruffalo voices several alternate versions of Banner in the animated series What If...?.

Bruce Banner is a renowned scientist, physicist, and medical doctor with seven PhDs. While working at Culver University, Virginia, Banner meets with General Thaddeus Ross, the father of his colleague and girlfriend Betty, regarding an experiment that Ross claims is meant to make humans immune to gamma radiation, a field in which Banner is an expert. The experiment, part of the World War II-era supersoldier program that Ross hopes to recreate, fails, and the exposure to the gamma radiation causes Banner to transform into the Hulk for the first time. The Hulk goes on a rampage, destroying the lab, killing three people and injuring several others. Banner subsequently becomes a fugitive from the U.S. military, particularly Ross, who wants to weaponize the Hulk process.

Five years later in 2010, Banner works at a soda bottling factory in Rocinha, Rio de Janeiro while searching for a cure for his condition, collaborating on the internet with a colleague he knows only as "Mr. Blue", and to whom he is "Mr. Green". He also learns yoga techniques to help keep The Hulk under control and has not transformed in five months. After Banner cuts his finger, a drop of his blood falls into a bottle, and is eventually ingested by an elderly consumer in Milwaukee, Wisconsin, giving him gamma sickness. Ross tracks down Banner, sending a special forces team led by Russian-born British Royal Marine Emil Blonsky to capture him. Banner transforms into the Hulk and defeats Blonsky's team. Blonsky agrees to be injected with a similar serum, which gives him enhanced speed, strength, agility, and healing, but also begins to deform his skeleton and impair his judgment.

In 2012, Banner, who changed his appearance, is working as a doctor in Calcutta when he is approached by S.H.I.E.L.D. agent Natasha Romanoff, who recruits him to help trace the Tesseract through its gamma radiation emissions. Going with Romanoff, Banner is introduced to Steve Rogers and S.H.I.E.L.D. director Nick Fury. He is on the Quinjet when Loki is captured by Tony Stark and Rogers. After Loki's brother Thor agrees to place Loki in a cell on S.H.I.E.L.D.'s Helicarrier, agents including Clint Barton mind-controlled by Loki attack the Helicarrier, causing Banner to transform into the Hulk and almost kill Romanoff. Thor attempts to stop the Hulk's rampage, with Hulk falling to the ground af