Robert Downey Jr. has been synonymous with Tony Stark ever since he debuted as the billionaire playboy and philanthropist in 2008's Iron Man. But in the grand tradition of Marvel's multiversal madness, Downey was in talks to play an entirely different Marvel character before being cast as Iron Man.
In a new retrospective celebrating the 15th anniversary of the film that kickstarted the Marvel Cinematic Universe, Jon Favreau — who both directed and starred in Iron Man as Happy Hogan — revealed that Downey was initially interested in playing the antagonist of 2005's Fantastic Four.
"I remember you had all met with [Downey] already for like Doctor Doom or something on another project," Favreau said during a conversation with Marvel's top boss Kevin Feige. "I think he had come through on maybe Fantastic Four, so everybody sort of knew who he was."