Alias follows Sydney Bristow, a young graduate student who is recruited as a secret agent for SD-6, a top-secret division of the CIA. After revealing her true identity to her fiancé, he is murdered by her superiors, prompting Sydney to discover that SD-6 is actually a rogue international criminal organization and an enemy of the United States. She subsequently becomes a double agent working for the real CIA to bring down SD-6 from the inside, balancing her dangerous espionage missions with her ordinary life and complicated relationships. As the series progresses, the narrative expands into deep mythological territory involving the 15th-century prophet Milo Rambaldi, whose futuristic inventions and prophecies drive the overarching conspiracies. Sydney is forced to navigate shifting loyalties, family secrets—most notably regarding her mother, Irina Derevko, who is a high-ranking KGB operative—and high-stakes globe-trotting operations alongside her handler, Michael Vaughn.
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Sydney Bristow grieves the murder of her fiancé after confessing her double life as a CIA agent, only to learn that her employers, SD-6, are actually terrorists. She goes to work as a double agent for the real CIA.
Sydney's dual life becomes even more complicated with the return of her mother, Irina Derevko, and the ultimate takedown of SD-6 once and for all.
Following a two-year time jump where Sydney loses her memory, she must piece together what happened to her while dealing with a new terrorist threat known as The Covenant.
Sydney joins a black-ops division of the CIA called APO (Authorized Personnel Only), led by her father Jack, bringing together old friends and enemies to stop global threats.
Pregnant and facing her final challenges, Sydney works to dismantle Prophet Five and neutralize her archnemesis, Sloane, once and for all in the shortened final season.