A game-changer. An event will dramatically shift the lives of every character. A crisis like no other. An explosive episode that will alter the face of Seattle Grace forever.

We've heard a lot of hype but relatively few details about the Grey's Anatomy season finale coming our way in just two weeks. So what actually happens on May 20?

Never one to let a day go by without relentlessly plugging the hit series she created back in 2005, Shonda Rhimes has more to share about the Season Six finale today:

“The theme of the first hour is sanctuary, which sort of uses the idea that the hospital is our characters’ safest place and our safest place as viewers,” Rhimes tells EW.

Bailey must make the toughest decision of all.

“[Then we go on to use] the hour to slowly turn all that on its head [so] that by the end, the hospital is definitely kind of the least safe place in the world.”

“The second hour,” she continues, “is about choices, and we get to watch our characters make big ones. Lexie chooses between Mark and Alex. Owen chooses between Teddy and Cristina, and Bailey faces the hardest medical choice that a doctor has to make."

"And the other choice that’s being made is Callie and Arizona, and whether or not they’re going to be together or not. It IS going to come down to the baby thing.”

Also, Meredith is going to have a lot going on in the finale. Trust us.

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Steve Marsi is the Managing Editor of TV Fanatic. Follow him on Google+ or email him here.