When Jamie & Tom get separated in the prehistoric jungle they each come across an enormous Permian beast.. .an estemmenosuchus & a moschops. Although shocked at first they both realize that these are gentle plant-eaters & theyre not in any danger. But as each of the giants spots the other one the boys realize that they may be harmless when theyre left alone but when another creature is on their territory they dont like it very much.. .in fact it makes them really angry! As the brutes battle it out Jamie Tom & Wanna have to try & come up with a way to stop the fight before one of them gets hurt.