01/24/2013 01:57 pm ET Updated Jan 24, 2013

12 Actors Who Almost Had The Part

Casting a Hollywood film takes a great deal of patience, especially when a studio's first choice turns down a role.

From "Iron Man" to "Pretty Woman," some of the biggest hits may have had a totally different look if the lead roles hadn't been passed on by other actors. We've gathered 12 major roles that were recast — and the actors who missed out on and scored the part.

Take a look through the slideshow below to see who almost headlined these iconic films.