Margot Kidder is a person.
Margot Kidder . She then appeared playing Siamese twins in Brian De Palma 's cult thriller Sisters ( 1973 ) ; in the slasher film Black Christmas ( 1974 ) ; and the drama The Great Waldo Pepper ( 1975 ) , opposite Robert Redford . By the 2000s , however , she had maintained steady work in independent films as well as television , with guest-starring roles on Smallville , Brothers & Sisters , and The L Word .