They come upon a Brontosaurus, which attacks Robert Phillips (Hugh Beaumont) as he retreats up a tree. Nolan and Wilson open fire, but they quickly discover that the dinosaur's thick hide absorbs bullets with little effect. Later that night they set up camp. When Nolan awakes, he finds Phillips and Russian scientist Michael Rostov (John Hoyt) gone. Phillips has gotten himself stuck in a large rock crevice near a Triceratops. Nolan accuses Rostov of arranging the accident on purpose, but Rostov insists that he was helping Phillips. The Triceratops nearly attacks the group, but another makes a challenge and the two dinosaurs fight to the death.