Jack Rowand/ABC
Natalie Abrams
April 14, 2016 AT 04:17 PM EDT

Worlds collide during Sunday’s episode of Once Upon a Time.

Ruby (Meghan Ory) and Mulan (Jamie Chung) return to the fold on Sunday, venturing to Oz in a bid to find Red’s pack. Instead, they’ll come across a new ally in Dorothy (Teri Reeves), who is initially less than pleased to meet these newcomers, especially when Zelena (Rebecca Mader) touches back down in Oz.

However, the trio will work together as they attempt to find a way to defeat the Wicked Witch once and for all, leading to Dorothy’s mysterious disappearance. When Ruby goes in search of her new friend, she lands in the Underworld, which is where our heroes discovered her in last Sunday’s episode. Check out a sneak peek of the trio’s first meeting above.

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

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