Prince Otto finds one of Nome King's 1908 tunnels under Oz to the Emerald City. Boris accidentally opens a box that holds Dot's beloved magic belt. While the kids try to keep their parents from finding out what happened, Otto steals the belt and turns all of the Oz Kids (except Dot) into glass figurines. It's up to Dot to save her friends, get her Magic Belt back, and get back to the Emerald City before their parents find out!