Sydney Bristow is not exactly your average grad student. Her life might appear normal, but she's hiding a secret life working as a spy for the CIA.Sydney's world is turned upside down when she learns she may work for the very enemy she thought she was fighting. Now she's entangled in a covert lifestyle where she is forced to question the allegiances of everyone, including those closest to her.
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All the Time in the World 05x17
Sydney and Jack must find a way to keep Sloane and Irina from putting their deadly plan into action.
Sloane takes Marshall and Rachel hostage in order to discover a crucial clue to Rambaldi's ultimate endgame, as Sydney, Vaughn and APO race to stop him.
No Hard Feelings 05x15
Sydney must stay undercover and partner with Sark to track down Rambaldi's final clue before Prophet Five finds it. Meanwhile, Vaughn sees daughter Isabelle for the first time, and Rachel discovers Tom's secret.
I See Dead People 05x14
Sydney must beat arch-nemesis Anna Espinosa to the punch when a mysterious chip found planted in Renee is tied to Vaughn. Meanwhile, Sloane struggles with ghostly visions while working for Prophet Five.
30 Seconds 05x13
Sloane is distressed to learn that Prophet Five's cure for Nadia is just as likely to kill her. Meanwhile, the search for Anna Espinosa continues, Rambaldi's prophetic Page 47 resurfaces, and Sydney offers Renee a job at APO.
There's Only One Sydney Bristow 05x12
As part of a plan to bring Sydney back into the field for Prophet Five's own purposes, Peyton has Anna Espinova kidnap Will Tippin.
Maternal Instinct 05x11
Irina returns and claiming to want to help, convinces Jack and Sydney to take her on a mission to retrieve The Horizon.
Marshall recovers an emergency transmission from Sydney but it's deleted by a Langley insider before he could listen to it - meaning Prophet Five has infiltrated the CIA.
The Horizon 05x09
Hoping to gain information from her, Prophet Five capture Sydney and makes her relive moments of her past with Vaughn.
Unaware of who the other really is, Rachel and Sark fall for each other while both undercover.