An earthquake stirs up yet another adventure for the Oz Kids. What begins as an innocent bus trip for Frank (the Wizard's son) turns into a wild underground ride for all the kids as they encounter dragonettes, merry-go-round mountains, an enormous teddy bear and more!
Prince Otto has no friends, so he decides to force the Oz Kids into a virtual reality computer game presented to them at Scraps's baby shower. Unfortunately, the patchwork baby gets into the game and overflows the number of players, trapping them in a deteriorating program from which they have little chance of escape. Otto had no wish to actually harm them, and must try to get them out.
Neddie (Dorothy's son) programs a computer belonging to the Wizard's son, Frank, to take him and Toto 2 to China. Once there, they are met by the Monkey Prince who steals the computer. Unless the other Oz Kids can find them, Neddie and Toto 2 will never get back to Emerald City!
Andrea, daughter of Glinda, who dresses like Ozma, accidentally sends Toto 2 to New York in a hot air balloon made by Frank, the Wizard's son. The other kids must follow the course set by Frank's computer to take them to him. When they arrive, their balloon is trashed, and they meet Rick, a homeless man who has adopted Toto. The strange appearance of some of the kids keeps plans to return from going smoothly, but are affected much more so by a clash of cultures.
Jack Pumpkinhead, a pal of the Oz Kids, who wants to take a boat ride with all of his friends. During the ride, the boat begins to sink and Jack and the Oz Kids enter the water. There they discover two mermaids who take them on a magical and adventurous underwater excursion. When Zog and the sea devils try to ruin their fun, the adventure gets more wild and exciting than Dot, Neddie and the Oz Kids ever expected.
The Nome Prince Otto finds one of his father's 1908 tunnels under Oz to the Emerald City. Boris, the Cowardly Lion's son, has accidentally released the hold on the display case of the magic belt, and Otto swipes it while the kids try to keep their parents from finding out what happened. When they try to retrieve the belt, Otto transforms them into ornaments in his father's favorite game, leaving Dot to discover who is who.
Santa Claus has been kidnapped, with Christmas just weeks away! The usually timid Boris (the Cowardly Lion's son) teams with an elf named Wisk to find St. Nick. Now the Oz Kids have to rescue Santa and Boris!
It's time for the Oz Kids' annual Christmas party, and everyone's invited — except for Otto the Nome Prince, that is. Otto is so upset that he steals Andrea's invitation. And Andrea (who inherited her mother Glinda's magic) believes she wasn't invited and joins forces with Otto to get even.
Mombi, an evil witch, has returned to Emerald City, kidnapping the Oz adults, good witch Glinda and the Nome King! Now it's up to Dot, Neddie and the Oz Kids to save Oz from Mombi's dark powers.