"Where Bluebirds Fly" is the eighteenth episode of Season Six of ABC's Once Upon a Time. It was written by David H. Goodman & Brigitte Hales, and directed by Michael Schultz. It os the one hundredth and twenty-ninth episode of the series overall, and premiered on April 23, 2017.
In flashback, Zelena befriends a young woodcutter who has been cursed and turns to her for help finding a new heart. Zelena is forced to choose between keeping her powers and her friendship with him. Meanwhile, in Storybrooke, Zelena decides to take on the Black Fairy and put a stop to her, once and for all, against Regina’s wishes, and the Charmings disagree over Emma and Hook’s wedding plans.