Okay, who doesn't love 'Little House on the Prairie'? If you don't, we're done! I'm kidding. I can't remember a time when I didn't watch LHOTP in reruns or when it was still airing on NBC in the early 80s. I've always been fascinated by the Oleson family of Walnut Grove: Nels, Harriet, Nellie, Willie, and later, Nancy. If there was one cast member who will never be able to escape her character, it's Alison Argrim aka Nellie Oleson, one of TV's original mean girls.