The people of Halidom have always derived their physical and mental abilities from three golden circlets worn by their ruler: the first around his forehead, the second on his right forearm, the third on his right thumb.

Awakening one day to discover that all the natives of Halidom are strangely languid, Fess learns that the second (and last remaining) circlet has been stolen.

Meanwhile, Dorothy Gale and the Cowardly Lion temporarily leave the Emerald City to place an order with the Easter Bunny, whose underground domain is conveniently accessible from Oz.

Robin Brown, an orphan from Oregon, USA, rides a magic merry-go-round horse to the Land of Oz.

The horse whisks him to the Quadling and Munchkin Countries of Oz, where Robin has adventures in View Halloo (a region dedicated to fox-hunting) and Roundabout (a land where everything is round, inhabited by Roundheads).