AVENGERS (1963) #44

Chaos ensues as the Avengers attack Colonel Ying’s base. The Red Guardian proves to be a formidable match for Captain America, but there’s something oddly familiar about this Super Soldier. The Avengers invade the futuristic city of General Brushov and Colonel Ling to rescue Hawkeye and Black Widow. The past of Natasha and the Red Guardian is finally revealed, and Black Widow joins the side of the angels!