Of course, we cannot forget the brains behind the whole operation, the genius that conceived most of these beloved characters, Stan Lee. He has actually made some special appearances and cameos in every movie where his characters were brought to the big screen. Every time a new movie was announced, fans couldn’t wait to see him again, even before the creation of Marvel’s Cinematic Universe as we know it today. His last appearance was in Avengers: Endgame, but it was a posthumous cameo.