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Official Site: NBC

Sarah Walker is the alias of one of the main characters of the fictional television show Chuck on NBC. Her first name was revealed to be Sam in "Chuck Versus the Fake Name," and her middle name Lisa in Chuck Versus the Wookie. She is portrayed by Yvonne Strahovski and is one of two agents assigned by the NSA and CIA to protect Chuck Bartowski after he unwittingly downloads the secret government computer known as the Intersect into his brain. She is the leading female character and main love interest of Chuck Bartowski.

Very little information about Sarah's past has been revealed so far. The only people outside of her family confirmed to know her real name, revealed to be "Sam", are Director Graham Her father was a con artist and much of her youth was spent moving from city to city under a series of aliases as part of his ongoing schemes. She attended at least her senior year of high school—and graduated in 1998—under the alias of Jenny Burton. While playing "Know Ya!" at the beginning of "Chuck Versus the Wookiee," she mentions having a sister; however, it is currently unknown whether this is true or part of the identity she created as part of her cover. Nothing has been revealed about Sarah's mother.

As a child growing up, Sarah was not only aware of her father's activities, but actively participated in them. One of their scams involved Sarah fooling an armored car driver into thinking she'd been hit by the vehicle while riding her bike, while her father claimed to be a doctor and examined her. During the confusion, he would then lift money from the vehicle. Another trick was the "Lichtenstein," in which her father would masquerade as a struggling German inventor or businessman attempting to unload an invention or other valuable commodity that never actually existed. Christmases were spent scamming the Salvation Army.

Sometime in 1998 before her graduation, Sarah's father was arrested for his own protection after a scam went wrong and put his life in danger. He left her a hidden cache of money for just such an emergency, and it was while recovering this that she was first approached by CIA Director Graham. He took her in as a protege after remarking on her many aliases as a child and gave her the cover name of Sarah Walker. Although apparently "recruited" at this point, flashbacks make it clear that she continued in high school; several of the popular children cruelly mocked her as the "jailbird's daughter" because of her father's imprisonment. She also spent a year with the Secret Service.

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