軍情五處第四季英文片名:《junqingwuchudisiji》,發布于2005年,由Alrick Riley,Bharat Nalluri,Sam Miller執導,并且由編劇攜幕后團隊創作。集眾多位Rupert Penry-Jones,米蘭達·萊森,Raza Jaffrey,彼得·弗斯等著名實力派明星加盟。并于2005年在英國上映。
Season four of espionage drama "MI-5" finds the team reeling from the loss of Danny (David Oyelowo), but thrown back into action when a bomb detonates near his funeral. Zafar Younis (Raza Jaffrey) and Juliet Shaw (Anna Chancellor) are introduced to the show, in a story involving a potentially devastating terrorist attack in the capital. Later in the season Lyndsay Duncan guest stars as a former MI-5 officer with a deadly grudge, one which threatens the lives of everyone back at The Grid.