Gary Burghoff once had a great idea for a Radar-focused episode of MASH that turned the character into a superhero, and a later outing recycled part of his idea. As is often pointed out in MASH trivia, Burghoff's Radar is the only actor from the movie to return for the show. Of course, the Robert Altman film was darker and more adult than the CBS sitcom was allowed to be. This can be reflected in the changes made to Radar himself; in the movie, he's a more cynical, opportunistic figure, while in the series, he's sweet and naive.
https://screenrant.com/mash-show-radars-dream-superhero-gary-burghoff-scrapped/