Seasonfourofespionagedrama“شڦانصا-5”findstheteamreelingfromthelossofDanny（DavidOyelowo），butthrownbackintoactionwhenabombdetonatesnearhisfuneral.ZafarYounis（RazaJaffrey）andJulietShaw（AnnaChancellor）areintroducedtotheshow，inastoryinvolvingapotentiallydevastatingterroristattackinthecapital.LaterintheseasonLyndsayDuncangueststarsasaformerMI 5officerwithadeadlygrudge，onewhichthreatensthelivesofeveryonebackatTheGrid。