Norma Macmillan, the voice of UNDERDOG's Sweet Polly Purebread, has passed away. She suffered a heart attack and died Friday afternoon at her home in Vancouver, British Columbia, Canada. She was 79. Macmillian also provided voices for Goo and other characters on THE GUMBY SHOW, Davey's sister Sally on DAVEY & GOLIATH and Kokette on MEAN MOE. During John F. Kennedy's presidency, Macmillan contributed voices to the popular Kennedy family parody album, THE FIRST FAMILY. She also appeared in such live-action features as HEAD OVER HEALS and BIG BULLY. She is survived by: her husband, actor Thor Arngrim; daughter, Alison Arngrim, who played Nellie Oleson on LITTLE HOUSE ON THE PRAIRIE; and her son, Stefan Arngrim, who played Barry Lockridge on LAND OF THE GIANTS.