Sarah Elizabeth Henrickson is a character on the HBO series Big Love. She is portrayed by Amanda Seyfried. Sarah is the eldest child of Bill Henrickson with his first and legal wife Barbara Henrickson. Though only a supporting character in the first two seasons, Sarah became popular in the show in its third season until actress Amanda Seyfried decided to depart the show to focus on her movie career at the end of season four. She returned in the series finale in the last scene.