Chip, Dale, Gadget, Monterey Jack and Zipper discover Klordane and Nimnul's devious scheme to create an underground earthquake via a giant gelatin mold for robbing the City's bank.
At the tomb of King Nutun-Khamun, an archaeologist finds the ring to unlock the diamonds of the Sphinx of Inka-dinka-do. His greedy assistant Wexler steals the ring and tries to hide it, putting the Rangers on the case.