Captain America, whose real name is Steve Rogers, a U.S. soldier created with the "Super-Soldier Serum", prevents a missile launch by the Nazis in the final days of World War II. The missile explosion, however, sends him into a catatonic state, and he falls into the icy waters of the North Atlantic, presumed dead. In the present day, more than sixty years later, Captain America is found and revived by a S.H.I.E.L.D team led by General Nick Fury and Betty Ross. Also present is Bruce Banner, Ross's boyfriend. They lead a team of government scientists working to recreate the Super-Soldier Serum in order to try a stop the real power that backed the Nazis - the alien Chitauri. Fury lets the captain to visit his past war colleague and his old girlfriend, plus visiting all the graves of the army during the war. Because of the loss of every soldier, Rogers regrets Fury taking him out of the ice. Rogers spots a destroyed part of town, in which Fury replies that Banner is the cause, and introduces the alter ego of Banner: the Hulk. A Chitauri attack forces Nick Fury's superiors and destroys the satellite used to detect the Chitauri, to order the creation of the initiative "Project Avenger", which involves the formation of a team of superhumans. Fury tries to recruit - with mixed success - Giant-Man and Wasp, at first failing but later recruited Iron Man, including Fury's second-in-command Black Widow - and after several setbacks the team unites to fight the Chitauri. Fury and the captain try to recruit Thor, but Thor refuses due to his strikes in the Antarctic. A Chitauri invades a secret base of S.H.I.E.L.D, thus alerting the team. The alien gathers top-secret information, and the team fails to stop it due to the activated security system. everyone except Black Widow quits, and Widow tries to convince Rogers to not quit. The Chitauri then attacks and destroys the S.H.I.E.L.D. Helicarrier. The aliens then attack S.H.I.E.L.D. headquarters itself. Every hero returns, including Thor. They defeat all the Chitauri. Banner uses the transmitted blood of Rogers to control his alter ego. This proves successful. Although successful, the team must then battle an enraged and out-of-control Hulk, as Banner releases his alter ego to aid in the battle. The team manages to eventually distract the Hulk long enough for Betty to calm him, and Banner is cured by Widow, then is incarcerated. The heroes then celebrate their success at the party area.