Jamie and Tom decide to practise their tracking skills in the secret Triassic dino world. With their little dinosaur friend, Wanna, in tow, they are soon on the trail of a herd of plateosaurs. But when a baby plateosaur is left behind, the boys and Wanna decide to help it get back to its herd. When they catch the herd up at a beautiful oasis, the boys sit down for a well-earned rest. But the plateosaurs are eating everything in sight, and the other creatures there don't look very happy about it, in fact they look like they might take out their anger on the boys! It's up to Jamie, Tom, and Wanna to divert the plateosaurs away from the oasis before they destroy everything.