To the rescue! Some of Hollywood's biggest stars have donned tights and capes to save the day as beloved superheroes -- see celebs including Ben Affleck, Chris Evans, and Gwyneth Paltrow as superheroes!
Robert Downey Jr.
The Oscar-nominated star has starred in multiple blockbusters as Tony Stark/Iron Man. He led three Iron Man movies as the hero, also appearing in The Avengers series.