1955) was also a child actor, perhaps best known for his role as Barry Lockridge on the Irwin Allen science fiction television series, Land of the Giants.

Arngrim would play the role of Nellie for seven seasons and her portrayal became a cultural reference and camp archetype for the spoiled "bad girl" throughout the 1970s.

After leaving Little House, Arngrim appeared in guest-starring roles on such television series as The Love Boat and Fantasy Island.

In 2017 in Pinehurst, North Carolina she appeared as Emily Brent in Judson Theatre Company's production of Agatha Christie's And Then There Were None.

One of her inspirations for her charity work is the memory of her friend and fellow actor Steve Tracy, who played the role of Nellie Oleson's husband, Percival Dalton, on Little House on the Prairie.

[13] In 2010, Arngrim authored an autobiography titled Confessions of a Prairie Bitch: How I Survived Nellie Oleson and Learned to Love Being Hated.