Samuel T. Philander, Professor Porter's academic rival who often takes credit for the Professor's findings and research, visits Africa believing that the Professor has found something spectacular there. The Professor does discover something, but only after Philander arrives- Tarzan shows Jane and him Pellucidar, a hidden land beneath Africa where Dinosaurs still live. Philander takes a camera (not knowing that a baby baboon had already used up all the film taking pictures of itself), but the Professor has none, so (unknown to the others) he tries to steal a Tyrannosaurus rex egg which hatches. This arouses the fury of the mother, who chases them until Porter returns the egg and they escape. Meanwhile, Philander returns to London to unveil his proof of living dinosaurs – only to discover the baboon's pictures instead.