The character was played by Clayton Norcross from the show's premiere in 1987 until 1989, by Jeff Trachta from 1989 until 1996 and Winsor Harmon from 1996 to 2016.
Actor Clayton Norcross debuted in the role of Thorne in the serial's premiere episode on March 23, 1987.
[1] On September 23, 2017, Harmon announced that executive producer Bradley Bell intended to recast the role of Thorne.
[2] Two days later, TV Insider's Michael Logan announced that former General Hospital actor Ingo Rademacher had been cast in the role of Thorne; he made his first appearance on November 27, 2017.
[3][4] On his exit, Harmon stated: "It shocked me, especially since [Executive Producer Brad Bell] had called said, 'I want you to come to the fan club event [in August].'
Thorne is raised in Beverly Hills with his siblings, Ridge (Ronn Moss), Kristen, and Felicia Forrester.
Thorne grows up in big brother Ridge's shadow and has a crush on his fiancée, Caroline Spencer (Joanna Johnson).
Drinking heavily while on sleeping pill, Thorne grabs Stephanie's gun and shoots Ridge in the head.
Thorne meets Macy Alexander (Bobbie Eakes), the daughter of Sally Spectra (Darlene Conley).
Thorne and Macy's attempts at communication are thwarted by Karen, her father, Bill Spencer, Sr. (Jim Storm), and Sly Donovan.
Thorne refuses to support Eric's marriage to Sheila Carter, so she spikes Macy's orange juice.
Thorne is recaptured and Macy tries to goad Anthony into confessing on tape but is discovered, and Sally is shot in the ensuing melée.
Grant is diagnosed with untreatable testicular cancer and wants Thorne to fulfill Macy's desire to have a family.
Thorne, who has quit Forrester Creations over Stephanie's preferential treatment of Ridge, steps in and saves Spectra Fashions from bankruptcy.
A sober Macy asks Thorne, who wants a divorce, to come to Big Bear for a last dance before ending their marriage.
At her funeral, Sally exposes Thorne's continuing relationship with Brooke, causing Stephanie to have another stroke.
Kimberly kisses Thorne backstage at a fashion show, and Bridget raises the curtain so the public see.
Brooke broke things off, and Kimberly takes advantage of an inebriated Thorne by lying that they'd had sex.
Thorne and Brooke reconcile and marry at the Forrester mansion, even managing to get last-minute support from the family.
Thorne is dismayed when Macy insists on staying in Italy and marrying her fiancé, Lorenzo Barelli.
Ridge overhears Eric call Thorne his "only son" and tries to stop Spectra's line from being stocked alongside Forrester in boutiques.
Thorne sells his Forrester shares and invests the money in Spectra, but loses it after another fashion showdown.
When Thorne proposes to Taylor, he is horrified to hear that she is responsible for Darla's death and feels betrayed that he was not told.
Thorne asks Donna to marry him, unaware that she is only using him to get back at Stephanie for constantly hurting Brooke.
Thorne is unhappy when Donna moves on to Eric, and finds himself bonding with Katie, although a romance doesn't develop.
Bill Spencer, Jr. (Don Diamont) takes control of Forrester and his new CEO wife, Katie, offers Thorne the vice presidency, but he refuses.
He joins his family in creating the ugly Dare line in an unsuccessful attempt to sabotage Bill.
Thorne returns after Aly's death in July 2015 and in September 2016 to stop Eric wedding to Quinn Fuller.
[8] Mason also placed Thorne 30th on his ranked list of The Bold and the Beautiful's Best of the Best Characters Ever, commenting "Insert head-shake here.
7 [Ridge] is cool and all, but that isn't — and, to be clear, never was — any reason to banish his oft-recast, perpetually-underused kid brother to the basement of the family's gladrags high-rise.