We never thought we'd see Santana like this. The New Directions member pays tribute to Michael Jackson here.
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The big letters in the background say it all here. Glee is paying tribute on "Michael" to, well, Michael Jackson.
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The Glee gang makes like MJ in this scene from "Michael." They are singing a classic King of Pop single.
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The Glee cast all takes to the stage in this shot from "Michael." It's the show's tribute to the King of Pop.
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Let's get synchronized! The Glee team lets loose in the pool in this shot from "Yes/No."
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Grant Gustin takes on the recurring role of Sebastian on Glee. He's often up to no good.
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Ricky Martin poses here with Glee cast members on his first day of shooting. He'll appear in early 2012 as a Spanish teacher.
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Mercedes makes like Sandy from the movie Grease in this Glee scene. It's courtesy of the episode "Yes/No."
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Glee Quotes

Rachel: This is what I wanted!
Sam: No, what you wanted was a second chance to get it right and Carmen just gave it to you. If you throw all that away you're going to be making the same mistake all over again

Finn: I seem to recall a rumor about a certain cheerleading coach at this school who once took horse estrogen and posed for Penthouse back in the day. So maybe I can just track that down and make a few copies and sell those to raise money for Regionals.
Sue: That's nothing but a rumor. But if that rumor were true, my Penthouse centerfold so groundbreaking that it completely redefined the term 'hirsute,' and gave birth unto these United States a pose so limber they named it the Regal American Not-So-Bald Spread Eagle, I promise you, my friend, you would never find it.