As season five begins, Vaughn is
abducted. Sydney learns that Vaughn is under
suspicion of being a double agent and that the crash
may have been a cover for his extraction. Vaughn
later escapes and explains to Sydney that his real
name is André Michaux. He reveals that he is
investigating a secret operation known as Prophet
Five, which at one point involved his father. During
a mission in recovering a Prophet Five book, Sydney
receives a phone call from her doctor with some
untimely news - she's pregnant. Vaughn is later
shot, and apparently killed, on orders of Prophet
Five operative Gordon Dean. Four months later, as
Sydney continues to investigate Vaughn's murder, she
works with an assassin and associate of his, Renée
Rienne, in order to unearth the inner workings of
Prophet Five, while at the same time trailing Dean
and his criminal organization "The Shed," disguised
as a black ops CIA division, very much like SD-6.
Two new members are added to APO to replace Weiss, who moved to Washington, D.C. for a new job, and Nadia, who is still in a coma. Thomas Grace is a brash young agent with unorthodox methods who often butts heads with Sydney. Rachel Gibson is a computer specialist who, like Sydney, was deceived into thinking she was working for the real CIA and briefly works as a mole within The Shed, as did Sydney within SD-6, before The Shed's destruction by Dean.
In an ongoing subplot, Arvin Sloane follows his own personal obsession, finding a cure for Nadia. Sloane is jailed for his actions during Season 4; however, he is released after the sentencing committee is manipulated by Dean. In exchange for his freedom, Sloane is now working for Dean as a mole within APO. Unaware of Sloane's new allegiance, Jack agrees to let Sloane rejoin APO and use its resources to seek a cure for his daughter.
With the series' end, it emerges that Sloane's ultimate goal is that of immortality, for which he sacrifices Nadia's life. However, he is trapped forever in Rambaldi's tomb by a critically wounded Jack, who sacrifices himself to avenge all the pain Sloane caused Sydney over the years. Sydney tracks Sark and the Horizon to Hong Kong, finding Irina. After a final battle between them, Irina plunges to her death.
The series ends with a flash forward to several years in the future. Sydney and Vaughn are semi-retired and married, with a second child named Jack in honor of Sydney's father. Daughter Isabelle exhibits the same ability to complete the CIA test that marked Sydney's inborn skills to be an ideal agent at that age. However after completing the puzzle she casually knocks it over, perhaps signaling that she will not follow in her mother's footsteps.
Two new members are added to APO to replace Weiss, who moved to Washington, D.C. for a new job, and Nadia, who is still in a coma. Thomas Grace is a brash young agent with unorthodox methods who often butts heads with Sydney. Rachel Gibson is a computer specialist who, like Sydney, was deceived into thinking she was working for the real CIA and briefly works as a mole within The Shed, as did Sydney within SD-6, before The Shed's destruction by Dean.
In an ongoing subplot, Arvin Sloane follows his own personal obsession, finding a cure for Nadia. Sloane is jailed for his actions during Season 4; however, he is released after the sentencing committee is manipulated by Dean. In exchange for his freedom, Sloane is now working for Dean as a mole within APO. Unaware of Sloane's new allegiance, Jack agrees to let Sloane rejoin APO and use its resources to seek a cure for his daughter.
With the series' end, it emerges that Sloane's ultimate goal is that of immortality, for which he sacrifices Nadia's life. However, he is trapped forever in Rambaldi's tomb by a critically wounded Jack, who sacrifices himself to avenge all the pain Sloane caused Sydney over the years. Sydney tracks Sark and the Horizon to Hong Kong, finding Irina. After a final battle between them, Irina plunges to her death.
The series ends with a flash forward to several years in the future. Sydney and Vaughn are semi-retired and married, with a second child named Jack in honor of Sydney's father. Daughter Isabelle exhibits the same ability to complete the CIA test that marked Sydney's inborn skills to be an ideal agent at that age. However after completing the puzzle she casually knocks it over, perhaps signaling that she will not follow in her mother's footsteps.
