What If 

In 1943, the year of the Marvel Cinematic Universe, when the Nazis have taken over almost all of Europe, Steve Rogers, the last hope of the Allies, is shot by Hydra spies while injecting Super soldier serum, and Peggy Carter is injected with the serum and becomes Captain Carter.

Stephen Strange had a car accident with his girlfriend Kristin Palmer on the way to an academic forum, and his girlfriend was killed. In despair, Strange began to learn witchcraft and became Doctor Strange. In order to find a way to revive his girlfriend, he did not care to absorb the dark power, but in this way he gradually lost himself......