Laura Prepon portrayed a character.
Laura Prepon . Following That '70s Show , Prepon worked mainly in television . Her other films include the romantic drama Come Early Morning ( 2006 ) , the comedy Lay the Favorite ( 2012 ) , the thriller The Girl on the Train ( 2016 ) , and The Hero ( 2017 ) . That '70s Show . The main teenage cast members were Topher Grace , Mila Kunis , Ashton Kutcher , Danny Masterson , Laura Prepon and Wilmer Valderrama .