EPISODE 5 – The Indicator
Jack's decision to sabotage Sydney's last mission while pinning it on Irina not only brings him closer to his daughter – it sends his ex-wife to death row. But his foolproof plan begins to unravel when Vaughn begins to put the pieces together – and Sydney makes a startling discovery about her childhood.

EPISODE 6 – Salvation
Sydney's fury at Jack's present betrayal and past sins leads her father to a desperate act to prove his love for her. Meanwhile, Vaughn – after enlisting Will in a seemingly benign CIA request – learns that a mission he and Sydney engaged in could have disastrous consequences for their health.

EPISODE 7 – The Counteragent
As Vaughn’s life hangs in the balance, Sydney has no choice but to turn to Sark for help in securing an antidote for the virus. But when Sark demands she help him kill Arvin Sloane in exchange for is assistance, Sydney faces a decision that could expose her as a double agent.

EPISODE 8 – Passage, Part I
Sark’s alliance with Sd-6 suddenly puts Sydney at risk of being exposed as a double agent. She has no choice but to cooperate with his plan, until his alliance with Sloane sends several nuclear weapons into the wrong hands. Now, only Irina holds the key to unraveling Sark’s agenda – and she refuses to cooperate.