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.
Sydney is recruited for a new black ops CIA division.
Sydney tells Vaughn what she learned about Jack in Wittenburg.
A special computer is stolen from NSA headquarters.
Sydney tries to buy a bio-weapon called Ice 5.
Sydney and Vaughn pose as Chechen spies in Russia.
Sydney begins hallucinating after being bitten by a man.
Sydney tries to deal with Nadia's wish to have Sloane in her personal life.
Sydney is assigned to stop her old nemesis Anna Espinosa.
Sark is brought before Sloane, who asks him to retrieve the bomb.
Sloane reveals a disc with incriminating evidence has been stolen.
Sydney acquires a microchip from a contact in Paris.
Nadia's past is revealed.
Sydney is buried alive, and Marshall is the only one who can rescue her.
Sydney requests files relating to Vaughn's father.
A masked gunman shoots Dixon.
A nuclear physicist is abducted in Poland.
Terrorists destroy an embassy in Copenhagen, killing 15 people.
Sydney tells Vaughn that she hasn't seen her father in two days.
The truth is revealed about the other Arvin Sloane.
Sophia says goodbye to Nadia and Sydney.
Nadia and Sydney go searching for Irina.
The reunited Bristows work to stop Elena.