The original and most well-known incarnation of Captain America is Steve Rogers, a frail young man who volunteered for a top-secret military experiment during World War II. The experiment transformed him into a super-soldier with enhanced strength, agility, and endurance. Armed with his indestructible shield, Captain America fought against the forces of evil, including the Nazis and other supervillains.

Throughout his comic book history, Captain America has been a symbol of patriotism, justice, and the American spirit. He has served as a founding member of the superhero team known as the Avengers and has had various adventures both as a solo hero and as part of different teams.