Kisa lives in a family that's almost nothing like Morgan's, but that doesn't stop the girls from being best friends. When the pair find a stray dog in a park, with a strange tag saying "You can keep this dog if you want" on one side and "But I warn you, she's trouble" on the other, they decide to adopt her. This presents a bit of a challenge, because Kisa already has a dog, and Morgan's mother not only doesn't like dogs, she doesn't approve of keeping pets. Undaunted, the girls take the dog to Kisa's house, where they're sure of a more welcome reception. But then they find out, the hard way, that this little pug can travel through time, and take children along for the ride. But accidental time travel can be fun, right? Um, maybe, sometimes. But not necessarily.