Modern youth Wu Eryang accidentally's soul transmigrates into the Miocene epoch, becoming a weak tabby cat and binding with a Husky-like devouring system. Relying on devouring behemoths to gain evolution points, he unlocks the ability to transform into a giant lizard. Along the way, he saves an orphaned cat Xiaohui, uses giant rhinos and biogas with clever plans to defeat powerful enemies, and collects fragments to grow saber-toothed fangs. Traveling all the way through swamps and icefields, he makes allies with Amebelodon and Diatryma, encounters the Hyaenodon Xueya Wang faction, and uncovers the sealed secret of the saber-toothed tiger clan being massacred. One man, one cat, and one system traverse the prehistoric wasteland, devour genes, and evolve step by step, vowing to gather all relics, take revenge for their clan, and dominate the ancient continent.