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Feeling left out of the group, Velma goes solo to investigate attacks by amphibious "Fish Freaks" in the area around an abandoned oil rig, only to find a friend of her own... in the form of a mermaid!
Frank Welker
Scooby-Doo / Fred Jones (voice)
Grey DeLisle
Daphne Blake (voice)
Mindy Cohn
Velma Dinkley (voice)
Matthew Lillard
Norville 'Shaggy' Rogers (voice)