It was autumn in Adventure Bay, and the pups were building a fort out of their pup-beds, however Marshall knocked it down while he was getting his bed out of his pup-house. Ryder was giving Katie and Cali a lift on his ATV to Jake's Mountain. Jake was at a snowboarding competition, so Katie and Cali were going to have a sleepover with Everest. Cali wasn't happy about it, she doesn't like being away from home. Katie brought Cali her favorite squeaky mouse toy for her to remind her of home. Then, Ryder, Katie, and Cali drove off to Jake's Resort.
Ryder dropped Katie and Cali at Jake's lodge, where Everest was waiting, but he drove off, he forgot that Cali's toy is left behind on his trailer. Everyone got inside to get warm, and Cali was still no use to be away from home. Minutes later, Katie and Everest were playing games. Then, the cookies in the oven were done, they both head to kitchen to get them. Cali was still homesick, without her toy, she's really missing home. So, Everest came with an idea to play a game they can all play together. While Everest and Katie were getting something, Cali decided to go back home, she took a cookie, put on Katie's winter hat, and left the lodge to find home.
Everest and Katie came back with a chest full of costumes for playing dress-up. Before they could play, they'd noticed Cali ran away into the woods. Cali was still walking through the woods, and she ate the whole cookie. The cold wind blew Cali's hat away, she started to chase it. Everest and Katie started looking for Cali in the woods, and they got lucky, they found some cookie crumbs on the grass. It was now getting dark and colder, and there were no more treat crumbs, they couldn't in time. Katie to call the PAW Patrol for help.
Ryder got Katie and Everest's call, he then, summoned the pups to the Lookout. As everyone was ready, Ryder told the pups about Cali lost in the woods. Their mission is to find her and bring her to Katie. Ryder hired Chase to use his drone and night vision goggles to find Cali in the dark, and Marshall to use his ladder in case Cali is stuck some place high. Ryder, Chase, and Marshall deployed in their vehicles and off they go to save Cali the city kitty.
For Cali, she was still lost in the forest and also cold. She found a knothole in a tree, she climbed up and began to sleep, until Little Hootie scared her out of there. The PAW Patrol met Katie and Everest at Jake's lodge. Everest felt sad for Cali being all alone in the woods, she asked Ryder if she could help look for her. Ryder let her join in, they all head for Cali's last known location. When they got there, Chase set out his drone to look around the area. Cali had found a log to sleep in, but there was skunk inside. Luckily, she didn't get sprayed on. The drone found Cali heading towards the beaver pond, and Everest knows the fastest way to get there, so they all follow her.
Cali was getting even colder, she entered the beaver dam to rest, but a beaver scared her out of there. Then, Cali saw the same skunk approaching her, she climbed up a tree to get away from it. Another beaver was chomping down the same tree Cali was on, she was about to fall off. As everyone made it to the pond, Chase began to use his night vision goggles to look for Cali. And, as he found her on the tree about to lean, Everest used her grappling hook to stop it from falling down. But the tree is too heavy, so everyone else helped her pulling it up. Marshall use his his ladder like a bridge to catch Cali. After Cali was saved, Ryder gave her her mouse.
Back at Jake's lodge, everyone was having a great sleepover, even Cali. Katie thank the PAW Patrol for finding and saving Cali, and Ryder said, "Whenever you or Katie takes a hike, just yelp for help." Then the episode ends with everyone dancing.