Born July 4th in 1920, Steven Grant Rogers was the child of poor Irish immigrants, Sarah and Joseph Rogers. He had a frail youth, however, a strong sense of duty and honor. Soon, however, his father died and when he grew up to his teens, his mother died of pneumonia. When World War II broke out, Steve was alone. And seeing how the Nazis were destroying Europe made him feel like he needed to do something. When he tried to attend the military, though, he was rejected due to his frail body and sickly nature. Hearing about the boy's attempt, general Chester Phillips decided to talk to him about the experiment known as Project Rebirth.

Steve accepted the offer and after weeks of tests, he was finally administered with the Super-Soldier Serum. His body and mind grew much more powerful and he was deemed as successful. However, a Nazi spy killed the doctor responsible for the project, leaving Steve as the only Super-Soldier ever developed during World War II. He immediately began training, both physical and mental, as his mind was being filled with false information in case of being captured by the enemy. He was being stuffed with info such as him having a brother and it would take until much later in his life that he remembered the truth. He was given the legendary white, blue and red costume alongside the disc-shaped shield made of Vibranium. He soon met a friend, Bucky Barnes and the two became inseparable friends during the War. On their last mission, however, Bucky was presumed dead when the two tried to stop a bomb-armed plane drone. The two fell into the freezing Arctic waters and the Captain was frozen solid, due to the Super-Soldier Serum protecting his bodily fluids from crystallization.

Years and years later, Steve was discovered by the superhero team named Avengers. When they put him on a table, discussing what they should do with him, he bursted out of the block of ice. Confused and scared, he soon met Nick Fury, the leader of S.H.I.E.L.D. Fury reminded Rogers of his WWII past and after some time of getting used to the modern times, he was accepted as the leader of the Avengers.