Sydney and Vaughn are sent to retrieve the Doleac Agenda to gain an advantage over The Covenant. For this, Sydney and Weiss must convince rogue security systems designer ...

Jack contacts a mysterious woman, that of former KGB agent Katya Derevko, Irina's older sister, to help him free Sydney and Vaughn, whose plane has crashed inside North K ...

In this episode, Sydney finally learns the shocking truth about her missing two years from an unlikely source: FBI Special Officer Kendall. Kendall whisks her away and ta ...

The identity of the mysterious St. Aidan forces Sydney to pull a stunned Will Tippin out of witness protection for help in finding Lazarey to clear her name. But the purs ...

After making a shocking discovery of a severed human hand in the desert that belonged to Lazarey, the Russian diplomat she murdered while working as a brainwashed assassi ...

When Sydney is taken into custody by the NSC honcho Mr. Lindsey, Jack and Vaughn have no choice but to ally themselves with Sloane to rescue her. But with only hours to s ...

Jack takes drastic measures to ensure that the NSC never finds out the truth about Sydney's murder of the Russian diplomat Lazarey. But, his actions place a heavy strain ...

Sydney's emotions are turned inside-out when she once again comes face-to-face with Allison Doren, the murdered Francie's doppelgänger, who was presumed dead but is now ...

While Vaughn's life hangs in the balance, Lauren butts heads with Sydney after learning the part she played in his stabbing. Meanwhile, Sydney further questions Sloane's ...

Sydney discovers a link to her missing two years in the form of Simon Walker, the dangerous leader of a group determined on retrieving deadly biological weapons. Meanwhil ...

Sydney and Vaughn are reunited again as a team to prevent Sark, now a head leader of the Covenant, from destroying the nation's satellite communications system. Meanwhile ...

Sydney's search for her past leads to an imprisoned Sark, but their QandA is cut short when he becomes the ransom for a pair of abducted CIA scientists by the Covenant, w ...

Having woken up in Hong Kong, with no memory for the last two years (!), Sydney returns to Los Angeles to try to piece together the last two years of her life and discove ...