When Victor, a kid who loves science and experimenting, loses his dog Sparky in a terrible accident he tries to find a way to bring his pet back.

Victor has messed up his vows during a wedding rehearsal, and is traveling through the woods, reciting his vows. He stops to rest in the woods, and while practicing. He finally gets them right and ceremoniously puts the wedding ring on a finger-shaped stick in the ground and says his wedding vows. The stick turns out to be a rotted finger belonging to a murdered girl who has returned as a zombie and insists that she is now Victor's lawfully wedded...

With hundreds of cases solved and adventures shared, Scooby and the gang face their biggest, most challenging mystery ever. Discovering that Scooby has a secret legacy and epic destiny, Shaggy remembers how he met the puppy and how Mystery, Inc. was formed.