My Little Pony: Friendship is Magic - Evil Necklace.

So… now we have evil artifacts that will do… bad stuff?

Again, I can't help but ask why they can't get Celestia or Luna to come through the mirror too and help out. Sure, the first movie had some stupid excuse about "balance" and what not… But considering everyone now knows that Twilight's a talking animal from another alternate-world… that really doesn't cut it anymore.