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The gang discovers the ghost of Mr. Hyde in the Mystery Machine.
Movie rating: 8.5 / 10 (149)
Directed by: Joseph Barbera - William Hanna
Writer credits: Larz Bourne - Tom Dagenais
Cast: Don Messick - Casey Kasem - Frank Welker - Heather North - Nicole Jaffe
AKA: W-Who's S-S-Scared?, Mystery Five, Scooby Doo, Where Are You!, Mysteries Five, Scooby-Doo: Mystery Mask Mix-Up, ¡Scooby Doo, dónde estás!, Scooby-Doo's Creepiest Capers, Hol vagy Scooby Doo!