Thundarr, Princess Ariel, and Ookla battle the evil wizard Vashtarr when he steals the Crystal of Prophecy that can give the details of his downfall. When it shatters in his efforts to retrieve it, the prophecy is foretold as they learn three women will unite to defeat him. One is Maya, an element-shifter buried in the ruins of the old city of Endorr. Another is Cinda, a hermitic barbarian living in the Canyon of Death whose staff grants her great strength. The last is Valerie Storm, a fashion model from Old Earth who is abducted and taken prisoner by Vashtarr himself.