Melissa Sue Anderson is an American-Canadian actress. She began her career as a child actress. Anderson is known for her role as Mary Ingalls on the NBC drama series Little House on the Prairie. She is also known for her film roles; Vivian in Midnight Offerings, Ginny in the cult classic slasher Happy Birthday to Me, and Alex in the ABC Afterschool Special, Which Mother Is Mine?, for which she won an Emmy Award in 1979.
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