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Marla Lynn Pennington (born March 5, 1954) is an American actress. She is best known for her role as Joan Anderson Lawson on Small Wonder, her last acting role to date. Her other television credits include Soap, Diff'rent Strokes, Magnum, P.I., Charlie's Angels, Happy Days, The Incredible Hulk, and General Hospital. Pennington's film credits include National Lampoon's Class Reunion, and The Day of the Locust.