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Zelena, Belle, and Zelena's baby daughter are all pulled to the Underworld by Gold's portal spell. Meanwhile, in the past, the connection between Hades and Zelena is revealed.
In the Underworld, Hook is reunited with his older brother Liam. Liam offers to help the group find the Storybook and the pages containing Hades' weakness... and then makes a deal with the Lord of the Underworld. In the past, Liam leads a mutiny against Captain Silver, and makes a deal with Hades to ensure his success.
In the Underworld, Hades convinces Gaston to hunt down the Beast that killed him--Gold. While Belle tries to find an alternative, Hades offers her a deal of her own. In the past, the circumstances behind Gaston and Belle meeting for the first time are explored.
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?