On Sunday night's episode of Once Upon a Time, two villainous characters will face off in a cowboy western-style duel.

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Zelena (Rebecca Mader) and Regina (Lana Parrilla) will be facing off on the next episode of Once Upon a Time, titled It's Not Easy Being Green. The two "evil" sisters will square off in the middle of town, and Zelena's portrayer Mader is excited for the big moment.

"It's pretty epic," Mader told TVGuide.com in a Friday report. "It's definitely the showdown of all showdowns. I couldn't believe it. They basically shot it like a cowboy western. The promo is so fitting. It was a really big night and a big shoot. It's all built to this moment of who's going to win: Wicked vs. Evil. It's a pretty exciting moment in Sunday night's episode."

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Zelena's identity as the Wicked Witch has been exposed, but that isn't stopping her from carrying out her plans.

"She's very set on her end game," Mader said. "She feels very in control of her mission. If you control the dagger, you have nothing to fear."

Enstars: sneak peek

Once Upon a Time season 3 airs Sundays at 8 p.m. on ABC.

Watch the promo for Sunday night's episode of Once Upon a Time here:

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Once Upon A Time, Television, ABC