Norma MacMillan
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Norma MacMillan (b. 15 September 1921, Vancouver, British Columbia - d. 16 March 2001, Vancouver, British Columbia) was a voice actress.
Her more famous roles included "Sweet Polly Purebred" in Underdog, and the title roles of Casper the Friendly Ghost, Gumby, and beginning in 1967, Davey of Davey and Goliath (previously voiced by Dick Beals).
She also voiced Caroline Kennedy and John F. Kennedy Jr. on the comedy album The First Family.
She was the mother of Alison Arngrim (best known as "Nellie Oleson" on Little House on the Prairie).