A sexy, high-octane thrill ride filled with espionage, intrigue and cliffhangers. It chronicles the adventures of operative Sydney Bristow as she battles shadowy intelligence agencies, along with some seriously twisted family members. During season 2, executive producer J.J. Abrams abandoned the double-agent angle, then revived it in the fourth year after the arrival of Syd's half-sister and the show's move from a ratings-challenged Sunday slot to a plush post-Lost perch on Wednesdays.
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Here's how everything changed in "Chapter 6"