Thorson is best known for her role as
Tara King (succeeding
Diana Rigg as Emma Peel) in the last series of the British TV adventure series,
The Avengers, with the original star
Patrick Macnee. although Thorson did not reprise her role. Since then, Thorson appeared in character roles in many TV series and films, including
Thriller,
Return of the Saint,
Valentino,
The Greek Tycoon, the cult horror film
Curtains,
Blind Justice,
Alan Alda's
Sweet Liberty, and
Marblehead Manor. Thorson appeared from 1989 to 1992 in the daytime drama
One Life to Live as
Julia Wheaton Medina. From 1998 to 2000, she played Isabel in the Canadian series
Emily of New Moon. In 2002, Thorson portrayed a Supreme Court Justice in the movie
Half Past Dead with
Steven Seagal and
Ja Rule, and appeared in the 2006 action sequel
Max Havoc: Ring of Fire. Throughout 2006–07, Thorson played the villainous
Rosemary King in the ITV series
Emmerdale. Thorson has performed in many dramatic and musical stage productions, including appearances on
Broadway in Nell Dunn's
Steaming and Michael Frayn's
Noises Off!. In 1971, she starred alongside
Michael Crawford and
Anthony Valentine in the London West End hit show ''
No Sex Please, We're British and later appeared as Titania in A Midsummer Night's Dream at the Open Air Theatre, Regents Park, London. She also played Hester Salomon in a UK tour of Equus'' opposite
Simon Callow. In the summer of 2008, she appeared at the
Open Air Theatre,
Regent's Park in the
Lerner & Loewe musical,
Gigi. In 2013, Thorson appeared onstage in
Tracy Letts's play
August: Osage County about a dysfunctional family in Oklahoma. In 2014, she was slated to appear in
Jon Robin Baitz's play
Other Desert Cities. In 2013, Thorson produced a new stage play called
The Goodbye Bird written by
Colleen Murphy. ==Personal life==