You didn't just think these characters got popular all on their own, did you? No, in this Nerdist video, we meet the people behind Superhero Talent Agency and see the unique challenges that come with representing superheros. Like rehabilitating their image after they smash up a school.
There are a lot of references here, but I think my favorite cameo came from Batman. I don't know why that one in particular, but that poor assistant is dealing with a lot.