As a youth, Buck had fallen into an underground realm of dinosaurs and ran into trouble quickly, as a giant albino Baryonyx named Rudy attacked the weasel, costing him his eye. To bandage the wound, Buck tied a leaf around his head and attempted to escape Rudy by taking to the treetops, where he was confronted by the dinosaur, who emerged from the clouds and swallowed Buck whole Buck, however, would not go down without a fight: before he fell down Rudy's throat into his stomach, Buck seized Rudy's uvula and hung onto it tightly, swinging forward and back until he let go, launching himself through Rudy's closed jaws, where Buck rammed through the dinosaur's teeth, knocking one out in which Rudy was in pain afterwards. Buck then fashioned Rudy's Tooth into a weapon for himself and went on to survive in the dinosaur world