The storm gives no warning. The PAW Patrol's ship goes down, and the pups wash up somewhere which shouldn't even exist - an island where dinosaurs still roam, and the world looks exactly like it did millions of years ago.

Rex has been on the island for years. He is stranded but not beaten. He knows the island’s rhythms, creatures, and which parts to respect. For the first time, the pups are not walking in blind.

Then Mayor Humdinger arrives with machines and the kind of greed that does not stop to ask what it's breaking. His mining operation cracks something enormous loose deep underground.

The volcano wakes up.

What begins as survival becomes considerably more urgent. The pups run rescues they have never trained for, racing against time and geology to pull an island and its prehistoric population back from the edge before the mountain finishes what Humdinger starts.