Lisa is leading a dinosaur dig, and to her surprise, she finds something stunning! She finds a T-Rex skeleton and it is placed in the Museum of Natural History. She visits her discovery and takes a DNA sample. She has a villainous plan in mind. She takes the sample to Professor Frink where he does some experiments. He accidentally opens up a portal to the Jurassic period and the dinosaurs come back to life! Terrified, she makes a run for it, but a T-Rex catches her. The dinosaurs break free and terrorize the town. Before we know it, human progress has stopped and the earth is hurled back into dinosaur times. The dinosaurs roam freely.