 During a twister, Dorothy is hit on the head by a fence and she is once again whisked to the land of Oz. But this time, on her way to the Emerald City she discovers a terrible plot by the Witch Mombi to conquer Oz with an army of monster Green Elephants that s she s brewing up. She escapes with the help of Mombi s slave Pumpkinhead and together try to warn King Scarecrow and the her other friends that Mombi is coming. But find that her friends haven t quite changed as much as she thought. So it s up to her, Pumpkinhead and the living Carrasel horse Woodenhead to find a way to stop Mombi s Green Elephant.