Sydney Bristow (Jennifer Garner) discovers that her employer, SD6, is not part of the government but actually an enemy organization. She goes to work undercover at SD6 as a double agent, while actually working with the CIA. Her greatest ally is another fellow double agent: her father.
The reappearance of her mother rocks Sydney Bristow (Jennifer Garner), not to mention Jack, as they try to figure out her true loyalties.
Sydney struggles to discover what happened during the two missing years in her life and to deal with Vaughn being married to another woman.
The action explodes in the phenomenal fourth season of Alias. When Sydney (Jennifer Garner) leaves the CIA to join a powerful new Black Ops unit, she has no idea of the reunion in store for her. It's nonstop excitement, from the spectacular two-hour first episode to the stunning impact of the season finale.
The final season kicks off with a shocking revelation and never lets you catch your breath. Jennifer Garner stars as a secret agent facing one mother of a challenge. Old enemies and favorite guests return for the action-packed series finale.