Frederic Wilhelm C.J. Sjöström, known professionally as Freddie Stroma, is a British actor and model, best known for playing Cormac McLaggen in the Harry Potter film series and Luke in the 2011 musical comedy film Pitch Perfect. He starred as Adam Cromwell on the dramedy series Unreal, which premiered on Lifetime in June 2015. He starred as Brit Vayner in the 2016 Michael Bay war film, 13 Hours: The Secret Soldiers of Benghazi. In 2016, he played H.G. Wells in the ABC series Time After Time.