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Community, Joe McHale, Jim Rash

Vivian Zink/NBC

Spoiler alert! We're about to dig into the biggest, most jaw-dropping moments from Thurday night's TV. If you haven't yet watched a particular show, and don't want to be spoiled, skip to the next post!

Scandal And the mole is...Billy Chambers (Matt Letscher), aka Vice President Sally's (Kate Burton) assumed-to-be-dead chief of staff who was behind the mission to impeach Fitz (Tony Goldwyn) last season. And guess who's working with him? David. Freakin'. Rosen. (Josh Malina)! No more donuts for you, you wannabe gladiator! Quick, someone refill our glasses of red wine. 

Community: In the cult hit's season four (and possible series) finale, Jeff (Joel McHale) and Pierce (Chevy Chase) graduated from Greendale! Yes, really. So what's next for the group's leader? He's not quite ready to say goodbye to his Greendale fam, so he's going to work at a small local law firm (helping the little guy, my how he's grown up!) so he can drop by whenever.

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Grey's Anatomy: Matthew (Justin Bruening) proposed to April (Sarah Drew) with a flash mob! Too bad we still like Jackson (Jesse Williams) more, but April says yes anyway. But she locks eyes with Jackson as she embraces her new fiancée. (Watch the fun proposal above!)

Oh, and Arizona (Jessica Capshaw) cheated on Callie (Sara Ramirez) with Lauren (Hilarie Burton)!

Yikes!

What did you watch Thursday night?

PHOTOS: 2013 May finale spoiler-rama!