'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.

When we caught up with Jessica earlier this year, she said that, although she had yet to film her guest-starring turn, she was busy preparing for her first turn as an actress.

"I've been practicing my acting," she said. "It's like a whole new element for me. I've never acted before, so I mean, it's just like dancing; it's unexpected. So we'll see how I do."

Somehow, Jessica, we think you'll do just fine.

Are you excited to see Jessica on this week's "Glee"?