The doctors will have to deal with a big shocker at the Grey Sloan Memorial during the upcoming season finale of Grey’s Anatomy on Thursday.

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In an episode teaser, April is seen breaking the news of her pregnancy to Owen.

“I know it’s sudden and it’s on and I know it makes your life hell but I will work until it falls out of me,” she tells him. “Kepners are built to have babies, sir, we drop them in fields.”

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Although April thinks his reaction will be negative, Owen replies, “Kepner, I’m happy for you. I’m thrilled. Congratulations.”

But, the happy moment is short-lived as Owen spots a tragedy on the television. The news station is reporting that there’s been an enormous explosion at a local Seattle mall that’s led to many deaths and injuries.

Owen and April immediately start to prepare the hospital for what’s to come. “Page all available surgeons,” Owen says to the staff. “Clear the ER,” April adds. And, it's clear that chaos is about to begin.

Aside from the devastating explosion, the doctors will also bid farewell to longtime colleague Cristina, played by Sandra Oh. Oh announced her decision to leave Grey's Anatomy back in August. The 42-year-old actress appeared on the ABC show since season 1 premiered in 2005.

-- The Grey's Anatomy season finale airs Thursday, May 15 at 9/8c on ABC.

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