Once Upon A Time Season 5 Episode 21: Last Rites Sneak Preview

ABC has released a sneak preview of next Sunday's episode of Once Upon a Time, titled "Last Rites."

The king of the underworld enters our world, igniting a devastating conflict that someone will not survive, breaking the very heart of Storybrooke forever!

Watch the episode's trailer in the video below.

"Last Rites" episode of Once Upon a Time will air Sunday, May 8 at 8:00 p.m. EDT on ABC.