Hulk

The Hulk (Bruce Banner) is a scientist when not transformed into the nine-foot creature. After a gamma radiation experiment went awry, mild-mannered scientist Dr. Bruce Banner found himself with a peculiar condition. When angered or provoked, he would transform into the uncontrollable, green-skinned monster known as the Hulk. Now, fearful of the damage that the Hulk could inflict, Dr. Banner chooses to live a discreet life in remote parts of the world, working to cure the sick and help the poor while trying to elude those who would take advantage of his ability to change into the enormous, green menace. When a mounting threat calls for Banner's specialized scientific expertise, S.H.I.E.L.D. Director Nick Fury recruits him, knowing full well that the incredible strength of Banner's alter ego, the Hulk, would be an asset to the Avengers.

Early life
David Bruce Banner was born on Thursday, December 18, 1969. Bruce met Betty Ross in college where they fall in love. They soon go to work together in Culver University as teachers. He soon meets Erik Selvig.

Gamma Accident
A gamma radiation accident gave Bruce Banner the alter ego, Hulk, and hospitalized his lover Betty Ross. Now a fugitive from the United States Army, and Betty's father, General Thaddeus Ross, Banner goes on the run for five years. He settles in Brazil, working in a soft drink bottling factory while attempting to find a cure for his condition with the help of an Internet friend, "Mr. Blue". He also studies martial arts and meditative breathing techniques with a Brazilian Jujitsu expert to help control his emotions, and has not suffered a transformation for five months.

Going Back Home
After Banner suffers a cut, and his blood drips into a soda bottle eventually drank by an ill-fated consumer in Milwaukee, Wisconsin, Ross discovers Banner's location, and sends a team to capture him, led by Russian-born British special operations expert Emil Blonsky. Following a ferocious battle in the soft drink bottling plant where he transforms into the Hulk, Banner escapes Blonsky, and ends up in Guatemala. He travels to the United States, where he sees that a now-recovered Betty is working at Culver University and is dating psychiatrist Leonard Samson. He also sees his old friend Stanley, a pizzeria owner, who gives him a job as a delivery boy. Banner uses this job to sneak past a security guard to continue his research. After Betty visits the pizzeria and sees Bruce, she later reunites with him.

Culver University attack
Blonsky reports to Ross that Banner evaded them in Brazil because of the appearance of a large green monster. Ross explains that the monster is Banner, and that he was created accidentally during an experiment in radiation-resistance that was inspired by World War II era military bio-force enhancement research (or "Super-Soldiers", as Blonsky puts it). Blonsky, seeking both revenge and power, volunteers as a test subject in order to capture Banner. He receives a small dose of the mothballed original Vita Ray serum, created by Dr. Reinstein for Weapon Plus. He leads an assault on Banner at Culver University, during which Betty is knocked unconscious. Despite Blonsky's increased strength, speed and agility, the Hulk crushes most of the bones in Blonsky's body. The Hulk saves Betty from an explosion and escapes with her to the Smoky Mountain National Forest.

Meeting Mr. Blue
Banner and Betty then travel to Empire State University in New York City, where they meet "Mr. Blue", Samuel Sterns. Accompanying Sterns to his lab, Banner and Betty learn that Sterns has developed a possible antidote that may cure Banner's condition or merely reverse each individual transformation while an overdose could kill him. Despite the risks, Banner agrees to test Sterns' antidote and is restrained before being shocked into transforming with electricity before being reverted to normal with an injection of the serum. Exhilarated by the success of the antidote, Sterns reveals that he has synthesized Banner's blood sample into a large supply with the intention of using it to enhance the human condition to the next evolutionary level. Appalled by what Sterns had done and fearful of the Hulk's power falling into the wrong hands, Banner attempts to convince Sterns to destroy the blood supply but is shot by a tranquilizer from one of General Ross' snipers.

Fighting the Abomination
As both Banner and Betty are taken into custody, Blonsky, whose super-soldier treatment has healed all his injuries but is desperate for more power, demands Sterns subject him to a dose of the Banner's gamma radiation treatment. Sterns warns that the combination of the Super Soldier formula and a gamma treatment would be an unpredictable combination that could turn him into an "Abomination". Blonsky is less than concerned about this, and Sterns promptly administers the gamma charge. As Blonsky mutates into the monstrous Abomination, he knocks Sterns aside and an irradiated sample of Banner's blood-derivative drips into an open wound on Sterns's temple, causing his cranium to mutate and expand. In an attempt to draw the Hulk out, the Abomination goes on a rampage through Harlem and Banner, realizing that he is the only one who can stop the Abomination, convinces General Ross to release him. He jumps out of Ross' helicopter as it hovers over the city, hoping the fall will stimulate his adrenal glands into triggering a transformation. Banner's plan succeeds and after a brutal battle the Hulk manages to defeat the Abomination by strangling him with a huge chain, though he releases his grip after a plea from Betty. The Abomination collapses, and the Hulk flees the scene with the army in hot pursuit.

Thirty-one days later, Banner is in Bella Coola, British Columbia. Instead of trying to suppress his transformations, he is attempting to initiate them in a controlled manner. As his eyes turn green, a grin appears on his face, meaning he has almost full control over the Hulk.

Initiation
"It's good to meet you, Dr. Banner. Your work on anti-electron collisions is unparalleled. And I'm a huge fan of how you lose control and turn into an enormous green rage monster."

- Iron Man

Banner is working as a doctor in India having not transformed for over a year. He is tricked into contact with Natasha Romanoff by a little girl and is brought into the Avengers Initiative and asked to find the Tesseract.

Hulk attacks the Helicarrier
After meeting members of the team on the Helicarrier, Banner and Tony Stark begin research on the recently captured Loki's spear. When the team begins to spark unnecessary arguments, the brainwashed Hawkeye leads a team into the ship and explodes one of the engines, causing Banner and Romanoff to fall into the weapons cache room. Banner transforms unwillingly despite Romanoff's efforts to calm him down and ends up falling off the helicarrier after causing much destruction and even throwing down with Thor. He eventually transforms back to Banner to find himself having been watched falling by a man. The man gives Banner new clothes.

Battle of New York
Banner returns to fight in the war in New York and finally reveals his secret of keeping calm: he is always angry. Banner transforms into Hulk and takes out a Leviathan with one punch then aids the Avengers in the battle. After assisting Thor, Hulk enters the Stark Tower and beats Loki into submission. The World Security Council eventually send a missile to destroy Manhattan. Stark flies the missile to the Chitauri's portal, though his suit shuts down in the progress. Hulk catches Stark and screams in his face, waking him up.

Later, all of the Avengers silently eat at a shawarma restaurant. After Loki is sent back to Asgard with Thor and the Tesserect, Banner and Stark drive away in one of Stark's sports cars and then the team go their separate ways.

Personality and traits
After the incident at Culver University, Banner became obsessed with finding a cure for his mutation. He is afraid of hurting someone unintentionally, so he tries not to get close to something or someone that leaves him stressed. He supplemented his scientific pursuit by learning meditation and breathing techniques, gaining a greater control over the transformations. When he transforms, his personality regresses to a more child-like state and he has little recollection of events after he returns to his normal human form.

In his earliest transformations, Banner appeared as a savage with no real ability to distinguish friend from foe. Because of this, he was responsible for the deaths of two scientists, an army officer, an police officer from Idaho and two Canadian hunters when he was a fugitive. The Hulk gradually attained a better reasoning capacity over time, becoming able to show affection and demonstrating a capacity to work collaboratively with others.

However, Banner has been shown that out of all the Avengers, he is the one they respect but fear the most. Even Romanoff, who always is calm in every situation, fears him as shown twice when she pull a gun on him in the hut when he appeared to lose his cool but in truth to see if she was truly alone or not and on the Helicarrier when they were blasted out of the lab and he transformed and attack her, showning terror in her face, very rarely does that happen with her.

Powers
Due to an combination of an similar version of the Super Soldier Serum and exposure to high levels of gamma radiation, Bruce Banner is an "mixed result" of what Rogers is. As Bruce Banner, he has no visible powers. But when his heart beat increases to high levels, he transforms into the monstrous Hulk, a green-skinned giant. The Hulk's physical body attributes him great strength and power, which is fuelled by his rage meaning the madder he gets the stronger he gets. The Hulk is one of the most powerful beings on the planet since his powers increase with his rage. He is capable of easily overpowering beings like Thor and the Abomination.

Metamorphosis: Banner transforms into the Hulk as a result of the chemical catalyst of adrenaline and gamma radiation. When Bruce gets angry or excited enough to increase his heart rate to high levels, he transforms into a powerfully muscled and green version of himself, generally referred to as the Hulk. According to Dr. Sterns, the "gamma pulse" comes from the amygdala, and the enhanced cells absorb the gamma energy temporarily, and then it abates when Banner gets stressed, resulting in a chemical reaction that produces a myostatin primer. When the Hulk transforms back into Banner, the excess muscle mass and energy is dissipated. The total time of transformation falls anywhere between seconds to several minutes, depending on the initial adrenaline surge, which will be determined by the original stimulus. Initially, he was unable to control the transformations, but through training and practice has managed to attain some level of control.

-Banner was unable to control the transformations, but through training and practice had managed to attain some level of control. Banner's consciousness is buried within the Hulk's, and can influence the Hulk's behavior only to a very limited extent such as when he changed into the Hulk to fight the Abomination where he managed to possess some human traits when asked by Betty Ross not to kill his enemy. Hulk also prevented an explosion from killing Betty and carried her to safety.

-After over four years of training to control the Hulk, Banner learned that if he always remains angry in a controlled state then he can easily change into the Hulk at will. This type of transformation allows the Hulk to be much smarter and less enraged than an uncontrolled one.

-However, if Bruce is sent into a state of stress then he can still lose control and transform against his will despite trying to control it. This Hulk seems to revert back to a savage enraged state where he would attack anyone being friend or foe.
 * Superhuman Strength: The Hulk´s primary power is his superhuman strength, enabling him to do feats like split a car in two with just two punches, he stopped an Humvee in its track and picked it up and slammed into a tree a couple of times, he also took the entire engine of the same Humvee and threw it into another Humvee, making it explode, throw Emil Blonsky more than 40 feet away with just one kick, even though the latter has been given great resistence, and throwing a forklift truck in the air very easily. He can throw normal humans around like ragdolls. In the form of the Hulk, Bruce possesses immense physical strength, almost unparalleled in the MCU except a few. As the Hulk he was able to rip steel as it was made of paper and was able to throw heavy objects with tremendous force. His strength is only rivalled by the Abomination or Thor. In times of stress the Hulk's adrenaline level escalates, causing a corresponding escalation in strength. This is not accompanied by an additional gain in mass, but does appear to promote increased levels of energy efficiency. To date the Hulk has never apparently been provoked into demonstrating a maximum output of strength, hence his upper limit could very well be limitless. However, if there is a limit, it is well in excess of 100 tons. This is also displayed when seeing Betty in danger in the damaged helicopter, he outmuscled the Abomination to free himself. By raising his fists and arms and striking the ground (accompany by one of his classic lines "Hulk Smash"), he can create tremors of incredible force that stun the Abominaiton. He was also able to go toe to toe against Thor with and without Mjolnir, demonstrating hitting him hard enough to make the thunder god's nose bleed. Moreover, he could defeat easily and individually the God of Mischief Loki by crushing him to the ground respectively. Another great demonstration was when he took down and killed a leviathan with one single massive punch. Most important of all, he tore through scores of Chitauri soldiers with ease.
 * Superhuman Leaps: The Hulk's great strength also extends into the highly developed muscles of his legs which allows him to leap great distances. When he transformed into the Hulk in the bottle factory in Rio, Banner escaped Blonsky and Ross to Guatemala, making it there by morning, making he traveled at least 1500 to 1600 miles in over 7 to 10 hours after the attack on him. In addition, the Hulk also shows incredible precision with his ability to aim his jumps and landings. He could reach the top of Stark Tower from ground level, in a single leap.
 * Weaponization: The Hulk demonstrates the ability of using his strength to turning anything in the envirnoment around him into weapons and/or armor to use. During the battle at Culver University, he turn pieces of a metal art work into a shield to use when Blonsky attacked him with a grenade launcher, using one piece to protect him against the waves of the sonic cannons and using the same piece to destroy one of the Humvees carrying one of the sonic by throwing it and splitting in half and then talking the other piece to jump into the other Humvee and basically jump diving into it and using it to destroy an attacking Apache helicopter. Finally, during the battle with the Abomination, he split a cop car in half and use it as pair of boxing gloves to beat into Blonsky and using a large chain that Blonsky was using to nearly choke him to death before being stopped by Betty.
 * Thunder Clap: By clapping his hands he was able to make a shockwave that snuffed out a fire.
 * Superhuman Durability: The Hulk is able to withstand substantial punishment; even high caliber bullets bounce off of him and the fire causes much less damage compared to a human. His bone, skin and muscles are overly dense, hard and tough and he possesses a high degree of resistance to injury, pain, and disease. Only beings with tremendous force or extremely powerful weapons can harm him. The Hulk also withstood multiple energy blasts from Chitauri weaponry, maximized cold without freezing in the Arctic Circle, and great impacts from heights of over six miles. After he tried to killed himself in the Arctic, he fell into the ocean but nonetheless, he was able to survive the tremendous presssures of the ocean's deep and then walked along the bottom of the ocean until he reached land, indicating his body has developed and evolved to a point that he can survive in even the most extreme and harshest of environments not most regular humans can survive in without specialized equipment.
 * Superhuman Endurance: Substantially greater endurance than a normal human. His body counteracts fatigue poisons that build up in his muscles during physical activity, allowing the Hulk to run and fight for a long time. While fighting others in an enraged state, he can maintain peak output for hours on end and still continue to become even stronger as his anger escalates.
 * Superhuman Speed: Regardless of his size, Hulk's superhumanly strong legs allow him to run at speeds that are far beyond the natural physical limits of even the finest human athlete. Nevertheless, this does not grant him any enhanced reflexes or agility as smaller foes exploit his size and use it to their advantage. Nonetheless, he was able to keep up with Blonsky (who himself was enhanced by Super Soldier Serum).
 * Superhuman Healing Factor: Despite his high resistance to physical harm, it is possible to cause the Hulk injury. However, The Hulk is capable of regenerating damaged or destroyed areas of his body with far greater speed and efficiency than an ordinary human. Grievous bodily harm has also proven to be a trigger for Banner's transformations, and he has recovered from otherwise fatal injuries sustained in his normal form. Banner said he tried to put a bullet through his mouth but the "other guy" spit it out. Hulk also has a enhanced immune system; Dr. Samuel Sterns described that a synthesized Banner's blood sample would make humans impervious to diseases.

Abilities
Bruce Banner is a gifted scientist with particular expertise in nuclear physics and biochemistry, famous for being one of the foremost geniuses of his generation. He is a highly rated expert in gamma radiation and according to Tony Stark his work on anti-electron collisions is unparalleled. Agent Coulson also compares him to Stephen Hawking. He learned Aikido and meditative breathing basic techniques, while in Brazil, with a martial arts expert.

As the Hulk, while having no formal training, he is a formidable hand to hand combatant simply due to his great physical attributes. He typically uses street fighting and brawling techniques that make full use of his strength. He also frequently employs pieces of his immediate environment to fight with, often to use as thrown objects to strike distant targets, and sometimes for melee attacks or protection.

Relationships

 * Betty Ross - Lover
 * Captain America - Avengers teammate and team leader
 * Iron Man - Avengers teammate
 * Thor Odinson - Avengers teammate
 * Black Widow - Avengers teammate
 * Hawkeye - Avengers teammate
 * Nick Fury - Ally
 * Erik Selvig - Ally
 * Loki Laufeyson - Enemy
 * Thaddeus Ross - Enemy
 * Abomination - Enemy
 * The Leader - Ally turned Enemy
 * Chitauri - Enemies

Trivia

 * There are several noticeable visual differences between The Hulk in The Incredible Hulk and The Avengers, despite the fact they are both in the same continuity. The Hulk in The Incredible Hulk is slightly taller than he is in The Avengers. He is more muscular in The Incredible Hulk then he is in The Avengers, and dark green skin, whereas in The Avengers he has brighter skin and a shorter hair cut. Their faces are also different. Much of these differences are because Mark Ruffalo is using motion-capture to actually play the Hulk, whereas Hulk was entirely CGI in The Incredible Hulk.