At Animal Ark, Mandy Hope helps her parents treat animals of all shapes and sizes. Even outside the clinic, Mandy can't resist helping any animal in need. The Hopes are in the small town of Churchill to watch polar bears migrating north. It's a spectacular sight. But when one of the cubs strays from his mother, Mandy fears for his safety. Can she help reunite the cub with his family before winter sets in?

While helping to set up a Santaland outside Walton Cottage Hospital, Mandy and James spot a stray Jack Russell terrier. They also befriend Charlie, a young patient, who desperately wants a dog for Christmas. Can they bring the two together?

While staying on Baffin Island, Mandy and her parents enjoy the thrill of a dogsled ride. But the trip is plunged into disaster when wolves attack one of the Husky teams. The lead dog, Nanook, is badly injured. Mandy helps move her to a secluded hut, but can she get the rescue party to Nanook in time?