Ernie and Bert are cavemen. Since they have no grocery stores or restaurants, they must find food on their own. Ernie finds a giant egg in a nest and he and Bert take it back to their cave. When Bert starts to cook it, it hatches and a baby dinosaur emerges, calling the attention of the Mama Dinosaur. After getting chased, they see how sad the mother is without her baby, so they give him back and are rewarded with bananas to eat.