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Sneak Peek Video: Glee Does Grease in Season 3, Episode 10: “Yes/No” — Behind the Scenes!

Sam is Danny. Mercedes is Sandy. Glee is doing Grease, and if this sneak peek promo is any indication, the entire song is going to be fantastic! Take a look at this behind-the-scenes peek at Season 3, Episode 10: “Yes/No.”

Original airdate: Tuesday, January 17, 2011 on Fox