While Cap lounges around Avengers Mansion, thinking about Bucky and his place in the world, a gang of costumed thugs break in intent on stealing any secrets or weapons Stark may have lying about the place, to sell for profit. They figure Cap's "just an acrobat." They figured wrong! He mops up the place with them single-handed, then comments how lucky they were his partners weren't around..."They're really tough!"; Baron Zemo sends the Army of Assassins after Cap, who is assisted by Rick Jones in defeating them.; Cap goes into Viet Nam to rescue prisoner of war Baker, and must face the Sumo.; Cap breaks up a prison riot.; President Roosevelt institutes the top-secret program, "Project Rebirth." In a secret lab, scientist Dr. Erskine gives army 4F reject and volunteer Steve Rogers the "Super-soldier serum," which turns him into a virtual superman. But a Nazi spy who got past security murders Erskine before he can create an army of men like Rogers, and is killed when he runs headlong into some electrical machinery. Rogers becomes the costumed Captain America, as a symbol of freedom, and begins a career of smashing spy rings and the like. When Bucky discovers Steve's double-identity, he becomes Cap's partner.