During a Friendship Mission with Twilight Sparkle and Rainbow Dash, Applejack went off on her own and found some kind of magic artifact.

When she touched it, she becomes corrupted and turns into a complete opposite of herself: a bratty, lying snob who is very rude to everypony around her! When she talks back to her own family, they force Applejack to move out until she improves on her mood.

With the help of Twilight and the others, she'll have to find a way to reverse the curse and turn herself back to her normal self: the helpful, honest pony everypony knows and loves.

Can she reverse the curse, or will she keep her rude personality forever?