While surveying the site of some ancient ruins, two young archaeologists, Derek and Margo, and their nomad friend Moki find themselves trapped and sinking in a whirling pool of sand. And when the dust settles, they stare up in awe at a vast chamber, filled with giant relics and artifacts from another civilization... And there, at the far end of the cavern, a door with a strange inscription - 'All who enter these portals pass through time!