Based on the Archie Comics novel The Chilling Adventures of Sabrina, the new Harvey that Lynch will portray in the series is described as "the prince charming of this dark fairy tale ... the son of a coal miner, a dreamboat and a dreamer, completely unaware of the dark forces conspiring to keep him and Sabrina apart." Nate Richert originally played the character in the '90s sitcom that starred Melissa Joan Hart as Sabrina.
Lynch took to social media later in the day to excitingly share the news with his fans. He also changed his Twitter profile pic to a cartoon version of Harvey.
Lynch joins previously announced cast members Kiernan Shipka as Sabrina, Miranda Otto as Sabrina's Aunt Zelda, Lucy Davis as Aunt Hilda, Chance Perdomo as Sabrina's cousin Ambrose, Jaz Sinclair as Sabrina’s best friend Rosalind, Michelle Gomez as Sabrina’s possessed teacher Mary Wardell, Richard Coyle as Father Blackwood and Bronson Pinchot as principal George Hawthorne.
Lynch first rose to fame for his starring roles as Austin Moon on Disney's Austin & Ally and Brady in the Teen Beach Movie franchise. He most recently portrayed serial killer Jeffrey Dahmer in 2017's My Friend Dahmer. Aside from acting, Lynch also keeps busy with his pop-rock band, R5, made up of his siblings, Riker, Rydel and Rocky, and their best friend, Ratliff.
ET spoke with Lynch last November, where he opened up about shedding his Disney Channel image. "Honestly, if you would have told me when I was on Austin & Ally that I was going to play Jeffrey Dahmer, I would have been like, 'No way,'" he shared. "But anything's possible!"
Hear more from the exclusive chat in the video below.