Citadel is an American spy action thriller television series created by Josh Appelbaum, Bryan Oh, and David Weil for Amazon Prime Video, with the Russo brothers acting as executive producers. It stars Richard Madden and Priyanka Chopra Jonas as Citadel agents Mason Kane and Nadia Sinh, respectively, with Stanley Tucci and Lesley Manville among the main cast

Josh Appelbaum is an American television writer, screenwriter, showrunner and producer.