Sydney and Vaughn go undercover to track down a deadly new bio-weapon. Meanwhile, Sydney is concerned about Vaughn not having yet put Lauren behind, and Nadia turns to a Jack to ask for his help in finding out the truth about her mother's murder, who tries to throw Nadia away from the evidence pointing to him. Written by
Did You Know?
Sloane tells Nadia that his affair with Irina was "brief". However, given that he once thought Sydney might be his daughter and that Irina left while pregnant by Sloane when Sydney was six, the affair must have been lengthy. See more
My sister may look like an angel but her heart is as black as yours and mine.
Written by J.J. Abrams
Performed by Michael Giacchino See more