Season four of espionage drama "MI-5" finds the team reeling from the loss of Danny , but thrown back into action when a bomb detonates near his funeral. Zafar Younis and Juliet Shaw 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.
