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The heroes return to Storybrooke but discovers that Hades has plans of his own to conquer the town. In the Underworld, Hook finds a new ally and together they set out to find the Storybook pages that show Hades' weakness.
Hades asks the heroes to help him make sure that Gold and Pan go through with their end of the deal so that he can get Zelena back. Once they do, the Underworld begins to fall apart and Henry offers to help the other residents find their unfinished business. Meanwhile, Cruella and the Blind Witch take steps to make sure the heroes don't escape. In the past, Emma meets a sympathetic bounty hunter who helps her find out about the parents who abandoned her.
Henry sets out to destroy magic and takes Violet with him. While Emma and Regina go after their son, the others try to create a portal to the Enchanted Forest and are transported to a mysterious land ruled over by a violent Warden with a grudge against Gold.
When the Savior becomes the "Dark Swan," the lines between good and evil blur as Emma begins to relish the intoxicating taste of absolute power. Terrified she'll succumb, Emma and Hook visit Camelot to find the one person who may be able to aid them: Merlin. Unfortunately, King Arthur proves treacherous, and when he joins forces with a vengeful Zelena, Emma and Hook's hopes are shattered. Now Emma and her entire Storybrooke family must embark on a chilling descent to the Underworld of Hades, where they'll try to rescue Hook from a fate worse than death... with "help" from Rumplestiltskin. But will any of them survive the journey?