Royce is a member of the ultra-secret service "Black Hole", working for the US Government on top-secret missions. When the senator responsible for forming Black Hole disbands the organization, Royce's fellow Black Hole members plot revenge on the man responsible for them losing their jobs. Royce decides not to join them, instead deciding to thwart their attempts to exact revenge on the senator.

Artist Steve Rogers is nearly murdered by spies, seeking his late father's national secrets. He is saved during surgery via a secret formula; this serum not only heals him but also gives him fantastic strength and lightning reflexes. To help 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.