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Sparky Marcus is a former actor. He was born in Hollywood. He was well known for playing the role of the precocious child but also worked extensively as a voice actor for Hanna-Barbera throughout the 1980s. He started acting at five playing Shelby on Sigmund and the Sea Monsters (1973–1975). He also appeared on The Nancy Walker Show (1976), Mary Hartman, Mary Hartman (1976–77) (Marcus played child evangelist Jimmy Joe Jeeter, who died of electrocution in the bathtub), and The Bad News Bears (1979-1980).
As a voice actor for cartoons he is probably best known for his role as Richie Rich from the Hanna Barbera series Richie Rich (1980–1982). He later had regular roles as a voice actor on Shirt Tales (1982–1984), Space Stars (1981), Challenge of the GoBots (1984), Cabbage Patch Kids: First Christmas (1984), Banjo the Woodpile Cat (1979) and The Get-Along Gang (1984–86).
Marcus has also made several TV guest appearances, including Trapper John, M.D., Happy Days, WKRP in Cincinnati, What's Happening!!, Maude, Emergency!, The Hardy Boys/Nancy Drew Mysteries, The Bob Newhart Show, Eight Is Enough and Starsky and Hutch.and Sigmund and The Sea Monsters.
Marcus also appeared in the feature films Freaky Friday (1976) as well as in many TV movies, including The Stableboy's Christmas (1978) and Goldie and the Boxer (1979).