3 Seasons already gone and the fourth to come! Great show!
Sydney Bristow (Jennifer Garner) is a super spy, fighting nefarious villains and working for the good guys--or so she thinks. Recruited as a college freshman for espionage work, Sydney found her true calling with SD-6, a secret division of the CIA.
When her hunky doctor-boyfriend proposes to her, she decides to let him in on the truth she's not supposed to tell anyone: she's not a grad student with a demanding job for an international bank, but a secret agent who constantly puts her life on the line for the free world.
But when SD-6 discovers her security breach, her fiancé is brutally assassinated, and Sydney suddenly finds herself face-to-face with the truth: she's been working for the bad guys.
Deciding to become a double agent for the CIA and bring down the evildoers, Sydney gets one more surprise--her estranged father (Victor Garber) is also working for SD-6, and the CIA as well.