Sydney Bristow is a designated international spy who is assigned to her first year of training for espionage and self-defense purposes. When she discovers that she has been deceived by a dark organization, she decides to cooperate with the real intelligence as a double agent.
After being trained in martial arts to become a secret agent, Sydney finds herself face to face with her mother, who is wanted by the CIA, and events follow.
Trained to become a secret agent, Sydney wakes up in Hong Kong with her memory lost, just before the search for her past leads to a jailed Sark while Vaughn makes a decision about his future at the CIA.
After being recruited to become an international spy, Sydney Bristow announces that she is leaving the CIA, before joining another intelligence unit, where she will discover the shocking truth about Irina's murder.
The final season opens with a series of shocking events as Sydney Bristow discovers the truth about Michael Vaughn, while old enemies return at the end of a journey filled with challenges and excitement.