Frederic Wilhelm C.J. Sjöström (born January 8, 1987), known professionally as Freddie Stroma, is a British actor and model, known for his work in roles including Cormac McLaggen in the Harry Potter film series; Adam Cromwell on the Lifetime series Unreal; Brit Vayner in 13 Hours: The Secret Soldiers of Benghazi (2016); H.G. Wells in the ABC series Time After Time; and Adrian Chase/Vigilante in Peacemaker.