The miniseries is a continuation of the classic story The Wonderful Wizard of Oz, with science fiction and additional fantasy elements added. It focuses on the adventures of a small-town waitress named DG who is pulled into a magical realm called the O.Z., ruled by the tyrannical sorceress Azkadellia. Together with her companions Glitch, Raw, and Cain, DG journeys to uncover her lost memories, find her true parents, and foil Azkadellia's plot to trap the O.Z. in eternal darkness.

Assigned to accompany two priests on a mission to convert the court of Kublai Khan to Christianity, Marco Polo is abandoned in the mountains when the priests, doubting the very existence of China, turn back. Polo eventually pushes bravely forth alone toward the fabled country where he is accepted as an envoy into Khan's court. Marooned on the far side of the world, Polo, accompanied by his servant, Pedro, advances as a Mongol grandee for twenty extraordinary years. What he eventually brings back with him to the West is a chronicle that changed history forever.