When a lost world of dinosaurs is discovered, Mayor Humdinger wants to take dino eggs back to Foggy Bottom but along the way a baby Brachiosaurus ends up in dino-sized trouble! The pups are ready for a dino rescue!
It all begins at the beach where the PAW Patrol pups are having fun. Marshall wonders when Ryder will return. Rocky and Zuma pondered the same thing until then Ryder rallied the pups to the Lookout for their surprise. The pups are happy to see Ryder until he called a new PAW Patrol member, Rex. The Paw Patrol are happy to meet him and they welcomed him into Adventure Bay, Zuma commented on how his wheelchair is cool. Rex tells them that it help him moved around. Rex name drops the six PAW Patrol pups and mixed up Rubble, Rocky. Skye is shocked to see that Rex is the only pup where he come from and then Ryder tell Robo-dog that they are ready to go. Marshall asked are they taking the PAW Patroller, but Ryder decides to take the Dino Patroller as the only way to get to Rex’s home.
Along the way, Mayor Humdinger and the Kitten Catastrophe Crew are on the way when they noticed the new Paw Patrol vehicle, evilly they trailed the PAW Patrol behind. They head via Jake’s mountain to the a big cave ornamented by prehistoric creatures, they passed through a cave and then emerged behind a waterfall. The pups are in awe the place and felt a rumble. They go outside and awe seeing the dinosaurs and Rex welcomed them to the Dino Wilds. Rex told them about Velociraptors, Triceratops, Pterodactyl. Rocky then commented that Rex knows a lot of Dinosaurs. Rex guides them to his place, an Dino Vet Center. Marshall is shocked to have a talking Dino. But it was revealed that their caretakers, Taylor Turbot and Dr. Turbot. Taylor already know them through their uncle, Horatio Turbot. Afterward they interact they head to the Dino Patroller.
Meanwhile, Mayor Humdinger emerged from the waterfall wet and complain that there are no bare necessities to survive and noticed a dinosaur causing the kitties to head back while Mayor Humdinger schemes to take dinosaurs to the outside world to use as an attraction for people. He chased the triceratops and along the way he noticed an egg. He decides to steal it. And leave. Meanwhile the Brachiosaurus became distressed and starts destroying the Dino Vet center. Dr. Turbot noticed its distress and begins to warn the PAW Patrol.
At the Dino Patroller, Ryder received the call and Ryder rallied to the Dino Tower. The pups are in awe gearing up and see the view of the tower. Ryder tells them about new gear. He ordered Rocky for repairs, Chase and Rex are ordered to herd the dinosaur and then begins to head to the rescue.
Rocky then begins to repairs. While Rex asked the mama why she is distressed. She roared and Rex translated that someone steals the eggs and who would do something. Mayor Humdinger plans to steal more dino eggs. Ryder then ordered Rex, Rocky and Chase to scour the jungle and Skye at the air to look for the person who steal the eggs. Mayor Humdinger steals the triceratops and t-rex’s eggs. The PAW Patrol searched until the t-rex chased them and Rex managed to stop them. Along the way, they found tracks. Ryder thinks that someone else had found a way to the Dino Wilds.
Mayor Humdinger search the tunnel home and along the way the eggs hatched. Timingly, the PAW Patrol cornered him. Mayor Humdinger tried to denied it but the egg hatched. Skye commented they are cute and Mayor Humdinger kidnaps the Baby Brachiosaurus. They felt a rumbled and notice mama Brachiosaurus heads after mayor humdinger. And Mayor Humdinger falls back to the bottom and Ryder called reinforcements to save the dinos from the rockslide. Marshall and Skye then saved the baby Brachiosaurus.
While at the bottom the Triceratops destroyed Mayor Humdinger’s kitten carrier and surrendered the baby to it. Mayor Humdinger then gets the T-Rex and makes a break for it. Chase and Rex are gone after the baby. The Baby T-rex trips Mayor Humdinger and flings himself to safety. Chase bounced the baby back and Rex caught it using his Dino Claw. The T-Rex are happy and they stomped Mayor Humdinger’s hat and Mayor Humdinger left the dino wilds, defeated and empty-handed.
Dr. Turbot and Taylor, along with the mama and baby Brachiosaurus, thanks the PAW Patrol. And Ryder tell that they should yelp for help if they have a big-dino problem. Skye, Marshall and Rex are happy that the baby Brachiosaurus have a new friend and they laugh as the episode ends.