In an American desert town circa 1955, the itinerary of a Junior Stargazer/Space Cadet convention is spectacularly disrupted by world-changing events.

In the future, an outbreak of canine flu leads the mayor of a Japanese city to banish all dogs to an island used as a garbage dump. The outcasts must soon embark on an epic journey when a 12-year-old boy arrives on the island to find his beloved pet.