Scooby-Doo and the gang team up with their pals, Bill Nye The Science Guy and Elvira Mistress of the Dark, to solve this mystery of gigantic proportions and save Crystal Cove!
Plot Keywords: halloween, friendship, friends, mystery, family
|Production Company||Warner Bros. Animation|
|Production Country||United States of America|
Top Billed Cast of Happy Halloween, Scooby-Doo!
Frank WelkerScooby-Doo / Fred Jones (voice)
Grey DeLisleDaphne Blake (voice)
Matthew LillardShaggy Rogers (voice)
Kate MicucciVelma Dinkley (voice)
Cassandra PetersonElvira (voice)
Bill NyeHimself (voice)
Dwight SchultzJonathan Crane (Scarecrow) (voice)
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