Unexpectedly, George, Jack and Brenda went back to the familiar prehistoric era. However, this era seemed to be slightly different from the previous Paleolithic era that they had gone through. They were then attacked by the huge Purussaurus, a giant caiman at the river in the dense forest. How are they going to get rid of the giant ferocious crocodiles? To their dismay the giant caiman was not the end to the adventurous journey. Titanoboa, the large snake was their biggest threat!