Abby Fairgate (formerly Cunningham, Ewing and Sumner) is a fictional character from the CBS soap opera Knots Landing, a long-running serial about middle class life on the fictional cul-de-sac known as Seaview Circle in Los Angeles, California. She was played by actress Donna Mills between 1980 and 1989. Abby was created by producer David Jacobs as one of Knots Landing's earliest characters. She debuted in the first episode of the second season. Mills remained a principal actor in the series until she left in its tenth season. She returned for the two-part series finale to provide closure for the fans. The character made her last television appearance in 1997, when she appeared in the Knots Landing reunion series Knots Landing: Back to the Cul-de-Sac, and was reunited with former cast membe