Doorman, in the comics, is a minor character, part of a group of lesser-known, mostly used as joke characters called the Great Lakes Avengers. He’s actually not the first of the GLA to show up in the MCU, since a version of Immortal Man popped up in the She-Hulk series. He’s been referenced several times so far during Wonder Man. Now, we finally get to see what happened that led to the “Doorman clause” that prohibits superhumans from working in Hollywood movies. Probably tv shows, too, but that hasn’t really been spelled out yet. They use black and white to emphasize that almost the entire episode is a flashback, as we get the story behind “Doorman.”