After seeing a boy billionaire ask for a specific railway car, Cruella tries to get rich quick by stealing the one on the Dearly's farm. However, the pups and the Colonel attempt to prevent Cruella from getting her hands on it, causing them to embark on a wild mountain chase.

Pug puts Rolly through a tough endurence test in an effort to get him kicked out of the Bark Brigade. But Rolly's expert tracking ability will save him.

Dumpling is bored, so she decides to join the pups' group despite the fact that they do not want her to, and she also causes them many problems.