Recasting happens for many reasons throughout Hollywood, from performers being ill-fitting for a particular role, a background character becoming more important in a sequel, or unavoidable real-life circumstances throwing a wrench into things.
With that said, recasting can also be a blessing in disguise, as there are more than a few replacements who have gone on to make the role their own and become synonymous with the character itself.
As such, I've assembled 12 recastings that worked out exceptionally as well as eight others that are better off forgotten:
There are obviously some spoilers ahead!