If you liked
Naruto: Shippuuden Movie 6 - Road to Ninja
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...then you might like
Gintama Movie 2: Kanketsu-hen - Yorozuya yo Eien Nare
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*SPOILERS* Both are movies of a well-known anime where the main characters goes to an alternative world where everything has changed. They both start off trying to find a way back to their own world, but there are things they have to do first. In both movies, the ing characters have changed (though much more in Naruto), and the antagonist is revealed to be the one you last expected.