The story begins with a young Allosaurus catching a lizard. The Allosaurus and his mother have a den located underneath an overhanging rock outcropping. However, they are soon attacked by a pack of Ceratosaurus; the young Allosaurus flees as its mother takes on, but is ultimately overwhelmed and killed by, the rival carnivores. Months go by, and the young Allosaurus is older, now a juvenile, but is still being hunted by the Ceratosaurus pack. The Allosaurus is chased all the way back to the scene of its mother's death, where he lures the Ceratosaurus pack under the outcropping. The outcropping collapses, seeming to bury all five of the pursuing predators under the rubble. However, they turn out only to be delayed by the rockslide.