If you learn anything from watching endless amounts of movies, it's that a villain isn't usually dead unless you see them die. And we never did see Red Skull perish, did we? Red Skull met his end during the climax of Captain America: The First Avenger after touching the Tesseract, though "met his end" is an inaccurate way to phrase it - in all likelihood, he was probably transported to another time or dimension. From the writers' perspective, though, it almost certainly wasn't their intention to kill this character off. So, of course, there's a theory out there which claims that Red Skull will return to cause major havoc during the Infinity War - and seek his revenge on Captain America - after being exposed to either the Space Gem or the Time Gem. It's a good theory too, because - unlike so many fan theories out there - it actually makes sense; he definitely exposed himself to an Infinity Stone. Could Red Skull thus return to assist Thanos in his evil scheme? Hugo Weaving, who played the villain in The First Avenger, has stated that he is unlikely to return to the role should Marvel ask him back. No matter: given the extensive make-up used to render this character on-screen, Red Skull is an easy character to recast.
Sam Hill is an ardent cinephile and has been writing about film professionally since 2008. He harbours a particular fondness for western and sci-fi movies.