Dougray Scott was originally selected to play the role of Wolverine in 2000. Unfortunately for him, filming of his movie Mission Impossible 2 was delayed, making it impossible for him to take on another job.
In a last-minute decision, director Bryan Singer was forced to recast the role. Lucky for us, Jackman was ready to bulk up and accept the challenge. He's been entertaining us and coming back for more ever since!
X-Men certainly isn't the only major project on the big and small screen that required a change in actors.
Benjamin Bratt stepped in for Al Pacino in this summer's Despicable Me 2. Pacino reportedly cited "creative differences" as the reason for his exit.
Finally, Jessica Chastain said yes to the starring role in Zero Dark Thirty after Rooney Mara's schedule conflicted with filming. Lucky for Chastain, her acting skills in the film earned her a Golden Globe Award. Not a bad payoff, in our opinion.