Mabel Elizabeth King (née Washington; December 25, 1932 - November 9, 1999) was an American actress and singer. She is 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 is also known for portraying Evillene the Witch, a role she originated in the stage musical The Wiz and reprised in Sidney Lume... show more