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Mabel Elizabeth King was an American actress and singer. She was known for her role as Mabel "Mama" Thomas on the ABC sitcom What's Happening!! from its premiere in 1976 until the end of its second season in 1978. King was also known for portraying Evillene the Witch, a role she originated in the stage musical The Wiz and reprised in Sidney Lumet's 1978 film adaptation. She recorded on the Rama Records and Amy Records labels. Wikipedia