The drama is at an all-time high this Thursday when Grey’s Anatomy Season 9 wraps up with an explosive finale (Episode 24: “Perfect Storm”). Not only will there be a superstorm that sends hurricane-level winds and rain through Seattle, but there will be emotional storms as two couples are in jeopardy for entirely different reasons.

For Meredith and Derek (aka MerDer), their son is about to be born, but it isn’t going to be a smooth ride. Mer’s contractions are painful; she finds out she has a C-section just as the power goes out; and something shocking happens in the delivery room. Equally nerve-racking is Calzona (Callie and Arizona), who will be dealing with the fallout of Arizona cheating with hot new doc Lauren.

To prepare you for the insanity of tomorrow’s episode, we've rounded up all of the sneak peeks for the episode right here. Spoilers ahead, so if you want to be surprised, turn away now!

First off, the storm is crazy. We knew this would be one for the record books, but we never expected almost all of the doctors to rush to save people from bus in flames!

Meanwhile, the power outage has the NICU staff stressed, and in the midst of that, Arizona has an awkward confrontation with Lauren.

 


MerDer is freaking out, too, but mostly because Meredith is having painful contractions!

Lastly, this extended sneak peek reveals the actual labor — aka her C-section in the dark, with the operating room lit only by flashlights. The final seconds have everyone scared for the baby.


The Season 9 finale of Grey’s Anatomy airs Thursday, May 16, 2013 at 9 p.m. ET/PT on ABC.

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Alyse Whitney is an editor at Wetpaint Entertainment. Follow her on Twitter @AlyseWhitney.