Iron Man has been on TV and in movies for 50 years, although the first 40 years of that was in animation only -and most of them after that! The look of the character has changed yet stayed the same, usually pretty faithful to the comic book version.
So, Robert Downey, Jr. is the only man to portray Iron Man as a live action hero? Okay, at least we have a lot of him. And a lot of Iron man incarnations you’ve never seen, in this timeline by Burger Fiction.
See also: The Evolution of Batman in Television & Film