Once Upon a Time: The Final Battle (Part 1)

"The Final Battle (Part 1)" is the twenty-first episode of the supernatural fantasy series Once Upon a Time and the first episode of the series overall. The episode was directed by Mark Mylod and written by series creators Adam Horowitz and Edward Kitsis. It first aired on ABC in the United States and on CTV in Canada on Sunday, May 14th, 2017 at 8:00 pm.