In Pellucidar, Tarzan is attacked by two velociraptors and flees away by swinging on vines. However, the dinosaurs pursue him and one of them manages to cut his vine, making him fall on the triceratops. The giant beast scares away the velociraptors, then he attacks Tarzan which flees toward his friends. Seeing the triceratops pursuing Tarzan, Jane gets the idea to ignite methane gas to stop him. Tarzan manages to lure the dinosaur to the gas pits and Jane ignite the gas with his flashlight, causing a jet of flames which scares away the triceratops.