![A panel from Marvel Mystery Comics #32, April 1942](https://www.codedread.com/comicbooks/wp-content/uploads/2019/03/captain-america-identity-revealed-1024x512.png)
In Marvel Mystery Comics #32 (April 1942), the Red Skull unmasks Captain America and discovers his secret identity as Steve Rogers. I believe this is the first time a villain learns the secret identity of a costumed hero and survives.
In Marvel Mystery Comics #32 (April 1942), the Red Skull unmasks Captain America and discovers his secret identity as Steve Rogers. I believe this is the first time a villain learns the secret identity of a costumed hero and survives.