Sandy Duncan's Jekyll and Hyde The gang arrives on the set of Sandy Duncan's remake of "Dr. Jeckyll and Mr.Hyde" just in time to battle the werewolf creature who's trying to sabotage the film. Details Casts Galleries Posters Season Lists Title Sandy Duncan's Jekyll and Hyde Genres Animation Mystery Comedy Kids Family Release Date 1972-10-21 Episode Runtime 00 Hours 40 Minutes Season Number 1 Episode Number 7 Production Companies Hanna-Barbera Productions Don Messick... Scooby-Doo (voice)... Casey Kasem... Shaggy (voice)... Frank Welker... Fred Jones (voice)... Nicole Jaffe... Velma (voice)... Heather North... Daphne (voice)... Original Size (3840x2160) Original Size (1920x1080) Original Size (2000x1125) Original Size (2000x1125) Original Size (1448x814) Original Size (2000x3000) Original Size (960x1440) Original Size (2000x3000) Season 1 16 Episode(s) 1972-09-09 Season 2 8 Episode(s) 1973-09-08