Driven to help out his country during World War II, Steve Rogers enlists in the military as part of Project Rebirth. After he impresses the scientist in charge of the project, Steve is injected with Super Soldier Serum, increasing his strength and physique. He becomes the patriotic hero Captain America, fighting for freedom throughout the world.
A British agent with the Strategic Scientific Reserve, Peggy Carter is a capable soldier and strategist. She is part of Project Rebirth, which developed the Super Soldier Serum that was injected into Steve Rogers. When Project Rebirth ends, Peggy continues to assist Steve as he becomes the world's first Super Hero, Captain America.