When a pack of senior dogs find themselves transported back in time—and turned into puppies!—they must make their way back home, helping real-life historical dogs along the way. In this first adventure, meet Baxter, Trevor, Newton, Titch, and Maia—the time dogs!—as they find themselves transported through time and space to 1925 Alaska. There, deep in the wilderness, the puppies must help Balto in his famous sled race to deliver medicine during a diphtheria outbreak.