After Zora Bennett and her team retrieve the dino DNA samples to make a cure for a heart disease, it works wonders. But overtime, it has beastly side effects. A virus is spread, but it doesn't affect dinos, only humans. Many humans die, and there's no hope in finding or creating a cure. The tables have turned. Humans are about to be extinct and dinos will be dominant again. Overtime, the virus does something worse to the remaining humans. Some end up "devolving." Their intelligence is lowered and/or they have physical traits of animals they have evolved from. Some humans with perfect chemistry cause them to grow large in stature, scales, claws, and even fangs. Some human/dinosaur hybrids give in to their savage predatory instincts and some still have their intellect intact. In fact, they are now able to talk to regular dinos. Owen is surprised that he can hear Blue speaking words, and Claire is surprised that while transforming, she actually lays eggs. During a journey to set things right, the gang faces dangerous obstacles like hungry carnivorous dinos... and devolved mutants! They also run into the "mutadons" from that isolated islands.
