Casey Kasem
Shaggy Rogers (voice)
Don Messick
Scooby-Doo / Scrappy-Doo (voice)
Rob Paulsen
Shreako / Dispatcher (voice)
Ronnie Schell
Freako / Demonstrator Ghost (voice)
Jerry Houser
Meako (voice)
Sorrell Booke
Sheriff Rufus Buzby / T.J. Buzby (voice)
Arte Johnson
Farquard / Skull Ghost (voice)
William Callaway
Billy Bob Scroggins / Beaureguard / Horseman / Ape (voice)
Victoria Carroll
Sadie Mae Scroggins (voice)
Michael Rye
Mayor (voice)
Hamilton Camp
Ghostly Laugh (uncredited voice)
June Foray
Witch (uncredited voice)