Description: Will and Holly find a crystal that holds the key to time travel, which they must use to save Cha-Ka from certain death. During what is the latest in a series of regular earthquakes, a door in the temple opens which leads to an unknown passageway. With Jack and Cha-Ka out running errands, Will and Holly decide to investigate on their own. In addition to the passageway leading to where the Sleestak live, they find a small plaque with a crystal, the plaque with some Altrusian engraving. They learn from Altrusian Enik that what they have found is a time traveling device, one which Enik has been looking for himself. They all realize the usefulness of the device to travel back to the time they arrived to make their way out of the Land of the Lost. Jack also discovers that the crystal specifically is a guide which will point them to the right place. But Enik will do whatever he needs to get the plaque himself so that he can travel home to warn his race of their impending evolution to become Sleestak. The Marshalls may find that they have a much more pressing need for the plaque to save Cha-Ka.