The next nine issues of Tales of Suspense starring Cap featured some of his WWII adventures and the first appearances of the Red Skull.
Tales of Suspense #63: The Origin story and first appearance of Bucky. During the 1940s, and Cap's original run, Bucky was another in a long line of teen sidekicks. Perhaps comic writers hoped to introduce a young hero for fans to identify with. Also, we see Steve Rogers as a bumbling private (think Christopher Reeves' Clark Kent). Bucky is the camp "mascot."
#64: Steve Rogers does KP while Captain America busts up a sabotage ring.
#65: The Red Skull's first appearance and he has a hit list.
#66: The Red Skull captures Cap, drugs him, and turns him into a Nazi operative. Also, his origin is revealed!
#67: Cap helps the Nazis break into Allied HQ to assassinate a high level general. Bucky escapes the firing squad.
#68: Cap escapes the effects of the drug and saves the general's life. The Nazis get ahold of a particle weapon, but are thwarted.
#69: A British scientist agrees to help the Nazis kill Cap and Bucky. They capture Bucky and lure Cap to Greymore Castle.
#70: Cap arrives, is captured, and the Nazis plan to launch him, Bucky, and the Scientist's sister in a V-2 rocket.
#71: Cap escapes, stops the Nazis, and uses the rocket to save American troops in Normandy. The scientist's sister is shot and killed by the Nazis and he goes insane. The castle explodes when the now-mad scientist blows it up. Only Bucky and Cap escape.
