Snow White (Ginnifer Goodwin) and Regina (Lana Parrilla) will be battling flying monkeys in the next episode of Once Upon a Time.

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A new sneak peek video of episode 12 was posted by Entertainment Weekly and features Snow and Regina facing off against the iconic flying monkeys from the Oz universe.

Once Upon a Time executive producer Adam Horowitz said that the second half of season 3 will have "a lot of the big touchstones from [L. Frank] Baum's books," but with a distinctly Once spin. "There's some fun surprises and hopefully interesting takes on that world that involve many of those people."

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The Wicked Witch (Rebecca Mader) will make her big debut in the next episode, though her identity will be kept secret to the show's fairy tale characters. Glinda the Good Witch (Sunny Mabrey) will also be appearing in upcoming episodes.

Horowitz also spoke to E! Online about the second half of season 3 and how it will different from the first half of the season.

"It's very different in its conception," he said. "The Wicked Witch is a big part of the second half and a driving force as an antagonist, but the world of Oz is not. It's a place that you will see and we'll spend a little bit of time there, but it's not a everybody-gets-on-a-ship-and-goes-there kind of thing."

Once Upon a Time season 3 returns with its midseason premiere on Sunday, March 9 at 8 p.m. on ABC.

Watch the sneak peek of Snow and Regina fighting the flying monkeys below:

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Once Upon A Time, Television, ABC