Howard Overman Creator, Writer, Executive Producer Gabriel Byrne Bill Ward Actor Elizabeth McGovern Helen Brown Actor Natasha Little Sarah Gresham Actor Léa Drucker Catherine Durand Actor Adel Bencherif Colonel Mokrani Actor Daisy Edgar-Jones Emily Gresham Actor Ty Tennant Tom Gresham Actor Stephen Campbell Moore Jonathan Gresham Actor Gilles Coulier Director, Executive Producer Richard Clark Director Johnny Capps Executive Producer Sara Johnson Executive Producer Julian Murphy Executive Producer