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Chuck: Chuck Versus the Cougars
At her new job at the Orange Orange, an old friend of Sarah shows up and reveals her real name as Chuck was listening in and decides to have some fun with it to the point of almost giving away her cover. He decides to obtain more info about Sarah when the girl's husband shows up and Chuck has a flash on him. Chuck, Casey and Sarah go undercover at Sarah's high school reunion and stop the sale of high-tech bomb plans getting into the hands of Russians.