The Chinese get their hands on SHIELD’s Life Model Decoy tech and build a Captain America LMD. They use it to create propaganda movies showing Captain America killing people in cold blood. The enables a cameo by Chairman Mao.
From there, we get Living Laser, Batroc, Swordsman, and an earthquake-making weapon called The Seismo Bomb. This is the stuff that makes Captain America comics great.
And the genius behind it all?
Dr. Faustus–in his first appearance.