The Most Successful Last-Minute Actor Replacements Ever

Some film roles are so perfectly cast that you have to assume the actor was the first choice all along, but there have been plenty of times when an actor replaced the original choice at the last minute, meaning they didn't get to do much preparation. Perhaps that spontaneity was beneficial, as there's no denying that Hugh Jackman is the definitive Wolverine, even if Dougray Scott was the original choice.