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Glee is back tonight with a brand-new episode. And if you’ve been paying attention, you know that it’s extra special because it’s based on… Grease! But before it begins — 9pm ET on FOX — there’s a few things you should know. Check out all the “Glease” facts below, and make sure to join the conversation before, during and after the ep on our Glee message board!

The music is awesome. “Greased Lightning,” “Beauty School Dropout,” “You’re the One that I Want”… EPIC! Go behind the scenes of “GL” here:

Speaking of, you can get all of the songs (plus the ones from previous shows) via Glee: The Music Presents Glease.

The Originals are returning! Technically, Mercedes and Mike already came back last week. But they’re back again, as is Santana it seems…

Depressed Blaine is heartbreaking. Okay, okay, this is from last week. But his rendition of “Hopelessly Devoted to You” made us both swoon and cry. Mostly cry.

And finally, who’s playing what. Let’s recap: Marley is Sandy, Ryder is Danny, Unique is Rizzo, Jake is Putzie, Kitty is Patty, Blaine is Teen Angel, Brittany is Cha Cha, Sugar is Frenchy, Tina is Jan, Sam is Kenickie, Joe is Doody. So far, there’s no Marty or Sonny. BUT, if you notice above, Santana’s wearing a Pink Ladies jacket. Is she taking on Marty, or replacing Unique as Rizzo?

EXCLUSIVE: Dianna Agron Talks About Her Glee Return!

Tagged: Glee