James Metcalfe Campbell Bower is an English actor, singer and model. He made his feature film debut in 2007 with a supporting role in Sweeney Todd: The Demon Barber of Fleet Street. He went on to feature in The Twilight Saga, The Mortal Instruments: City of Bones, and as the young Gellert Grindelwald in Harry Potter and the Deathly Hallows – Part 1 and Fantastic Beasts: The Crimes of Grindelwald. In 2022, Bower featured as Henry Creel / Vecna in the fourth season of the Netflix series Stranger Things, for which he received critical acclaim.

Sweeney Todd: The Demon Barber of Fleet Street is a 2007 musical slasher film directed by Tim Burton from a screenplay by John Logan, based on the stage musical of the same name by Stephen Sondheim and Hugh Wheeler, which in turn is based on the 1970 play Sweeney Todd by Christopher Bond. The film retells the melodramatic Victorian tale of Sweeney Todd, an English barber and serial killer who, while seeking revenge on Judge Turpin who wrongfully convicted and exiled him to steal his wife, murders his customers and, with the help of his accomplice, Mrs. Lovett, processes their corpses into meat pies.