20 puzzling movie sequel recastings explained

When it comes to building franchises, Hollywood tries desperately to stay consistent. If the first movie is a hit, studios will try their hardest to keep the same directors and actors on board as long as possible.

But there are instances when a change must be made. Sometimes for the betterment of a movie, but sometimes the change leaves viewers scratching their heads.

From "Batman" to The National Lampoon "Vacation" franchise, check out the most notable re-castings in movie history.