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"Where Bluebirds Fly" is the 129th episode of Once Upon a Time.
In Oz of the past, Zelena befriends a young, cursed woodcutter who turns to her for help finding a new heart, but all ends in the Wicked Witch being forced to choose between power and friendship. Meanwhile, in Storybrooke, where the Charmings are currently having a disagreement over Emma and Hook's wedding plans, Zelena of the present decides to take on the Black Fairy and put a stop to her once and for all, against Regina's wishes.
- The title card of this episode features the Emerald City of Oz.
- The title of this episode was officially confirmed by executive producer/co-creator Adam Horowitz, via his Twitter account, on February 3, 2017.
- This episode marks the twenty-fifth overall writing credit for David H. Goodman, and the fourth for Brigitte Hales.
Gallery of photographic stills released to promote the episode.