Captain America is a superhero appearing in American comic books published by Marvel Comics. Created by cartoonists Joe Simon and Jack Kirby, the character first appeared in Captain America Comics #1 (cover dated March 1941) from Timely Comics, a predecessor of Marvel Comics. Captain America was designed as a patriotic supersoldier who often fought the Axis powers of World War II and was Timely Comics' most popular character during the wartime period. The popularity of superheroes waned following the war, and the Captain America comic book was discontinued in 1950, with a short-lived revival in 1953. Since Marvel Comics revived the character in 1964, Captain America has remained in publication.
The character wears a costume bearing an American flag motif, and he utilizes a nearly-indestructible shield that he throws as a projectile. Captain America is the alter ego of Steve Rogers, a frail young artist enhanced to the peak of human perfection by an experimental "super-soldier serum" after joining the military to aid the United States government's efforts in World War II. Near the end of the war, he was trapped in ice and survived in suspended animation until he was revived in modern times. Although Captain America often struggles to maintain his ideals as a man out of his time, he remains a highly respected figure both with the American public and in the superhero community, which includes becoming the long-time leader of the Avengers.
Super Soldier Serum[]
The Super-Soldier Serum is somewhat of a misnomer, as the "serum" actually consists of various processes. Subjects that are considered to have been enhanced to their "Peak-Potential" are noted to be Captain America, Isaiah Bradley, Josiah X, Protocide via an SSS variant, and Union Jack via a different SSS. Variations of the Super-Soldier Serum have been developed over the years which induced greater-mutations than peak human capabilities. So far, it would appear that Captain America (Steve Rogers) is the "perfect man." The more powerful variants come with strange side-effects that may also include mental deficiencies. In the Marvel movies (MCU), the Hulk's origin was changed to be part of attempts to recreate the serum. Bruce Banner used an experimental serum on himself and then used a radiation machine on himself, according to General Ross Banner he didn't know what the formula really was, he thought it was to protect people from radiation. And the mixture of formula and radiation resulted in the Hulk.