humans immune to gamma radiation. The experiment—part of a World War II-era "super soldier" program that Ross hopes to re-create—fails. The exposure to gamma radiation causes Banner to transform into the Hulk for brief periods of time, whenever his heart rate rises above 200 beats per minute. The Hulk destroys the lab and surrounding area, killing several people inside and injuring the General and Betty, and others outside. Banner becomes a fugitive from the U.S. military and Ross, who wants to weaponize the Hulk. Five years later, Banner works at a bottling factory in Rocinha, Rio de Janeiro, Brazil, while searching for a cure for his condition. On the internet, he anonymously collaborates with a colleague known only as "Mr. Blue." He is learning Yoga techniques to help keep control and has not transformed in five months. After Banner cuts his finger, a drop of his blood falls into a bottle, which is eventually ingested by an elderly consumer in Milwaukee, Wisconsin, giving him gamma sickness. Using the bottle to track down Banner, Ross sends a special forces team, led by Emil Blonsky, to capture him. Banner transforms into the Hulk and defeats Blonsky's team, with Blonsky surviving. After Ross explains how Banner became the Hulk, Blonsky agrees to be injected with a small amount of a similar serum, which gives him enhanced speed, strength, agility, and healing powers but also begins to deform his skeleton and impairs his judgment. Banner returns to Culver University and reunites with Betty. Banner is attacked a second time by Ross and Blonsky's forces, tipped off by Betty's suspicious boyfriend, Leonard Samson, causing Banner to again transform into the Hulk. The ensuing battle outside the university proves futile for Ross's forces, and they retreat, though Blonsky, whose sanity is faltering, attacks and mocks the Hulk. The Hulk severely injures Blonsky and flees with Betty. After the Hulk reverts to Banner, he and Betty go on the run, and Banner contacts Mr. Blue, who urges them to meet him in New York City. Mr. Blue is actually cellular biologist Dr. Samuel Sterns, who tells Banner he has developed a possible antidote to Banner's condition. After a successful test, he warns Banner that the antidote may only reverse each transformation. Sterns reveals he has synthesized Banner's blood samples, which Banner sent from Brazil, into a large supply, to apply its "limitless potential" to medicine. Fearful of