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'Glee' First Look: Jessica Sanchez Tunes Up

Former "American Idol" contestant Jessica Sanchez will make her long-awaited "Glee" debut on Thursday, and we've got your first look!

The 17-year-old looks positively pensive in this still from "Lights Out," which finds the power cut at McKinley High, prompting an "unplugged" session for the glee club.

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