Once Upon a Time is going back to the land of Oz in the next episode of the series, and co-creators Edward Kitsis and Adam Horowitz recently previewed what to expect.

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Kitsis and Horowitz spoke with TVLine this week about what's ahead for the final arc of the season. As fans know, the next episode will feature a journey into the land of Oz to see the Wicked Witch (Rebecca Mader), through flashbacks of course.

"It's a lot of fun for us to dip our toes back into the world of Oz," Horowitz said. "We obviously love Rebecca [Mader], so it was so great to have her put the 'green' back on. It's fun to see Robin Hood kind of in his prime as the classic Robin Hood character, on an adventure that takes him out of Sherwood Forest and right into Oz."

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Kitsis added that "we're going to see how [Robin Hood] first met Will Scarlett" in the episode.

Viewers last saw the Wicked Witch a.k.a. Zelena in the second half of season 3. She was ultimately killed by Rumplestiltskin (Robert Carlyle) in the episode Snow Drifts.

The promo for next week's episode features the wickedly evil Zelena saying "wicked always wins." She is also shown cackling while flying on a broomstick. It remains to be seen what Robin Hood will be doing in Oz though it is sure to be interesting.

Once Upon a Time airs Sundays at 8 p.m. ET/PT on ABC.

Watch the promo for the next episode of Once Upon a Time here:

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Once Upon A Time, Television, ABC