An artist, Steve Rogers, is nearly murdered by spies, looking for his late father's national secrets. He is saved during surgery when a secret formula is injected into him; this serum not only heals him but also gives him fantastic strength and lightning reflexes.

To help him solve the mystery behind his father s murder and bring those guilty to justice, a government agency equips him with a special motorcycle loaded with gadgets and an indestructible shield. Now armed, he battles against the nation's enemies as the Sentinel of Liberty, Captain America.