Crash and Eddie are possums. Repeatedly got into trouble. However, friends always tried to rescue them to freedom, and wanted to keep them out of trouble on the next day. But it was almost impossible to stop the fast rodents. Once again, they got into trouble with the lost world. Previously, a mammoth and a saber-toothed tiger managed to visit here, they know that there are dinosaurs there, and this area is very dangerous for small possums. While they are looking for a way to go down and save their lives, the main characters get acquainted with the ferret Buck. He looks pretty impressive. But he's missing one eye. He told tall tales to newly-made friends about losing his eyesight in a battle with a predator.

The guys believed that these were just prejudices about the lost world, and there was nothing threatening them here. However, when they encountered a malicious spider, and later met a lot of different dinosaurs, they realized that they could not cope without a ferret. Joining forces with the character, they try to find a way to return home to the valley, and meet with friends. Meanwhile, the tiger and the mammoth travel along the trails, where many difficulties and dangers await them. But they don't give up until they save the possums.