TV Article The Flash taps Harry Potter alum Tom Felton as new series regular By Natalie Abrams Natalie Abrams Senior Writer EW's editorial guidelines Published on June 30, 2016 12:00PM EDT Photo: Jason LaVeris/FilmMagic The Flash is getting even more magical in season 3. Harry Potter alum Tom Felton has joined the cast as a series regular, EW has confirmed. As first reported by TVLine.com, Felton will play Julian Dorn, another CSI at the Central City Police Department who has suspicions about Barry Allen. It’s unclear what role Dorn will play in the Flashpoint storyline that was recently confirmed. More on that here. Best known for playing Draco Malfoy, Felton’s TV credits include Murder in the First and Full Circle. Harry Potter: Where Are They Now? The Flash returns Tuesday, Oct. 4 at 8 p.m. ET on The CW.