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The Groundsman helps the heroes escape from the evil Warden, but thongs are not what they appear. Meanwhile, Regina tries to make a deal with Gold, and Henry is forced to restore the magic that he destroyed to bring the heroes back.
While Regina tries to cope with Robin's death, Henry begins a new quest: to destroy the magic that has torn his family apart. Meanwhile, the malfunctioning magic sends David, Mary Margaret, Hook, and Zelena to a different reality where a sadistic Warden holds them against their will... and the Warden has secrets of his own to hide.moreless
After the heroes return to Storybrooke, they try stop Hades from using the Olympian Crystals to take over the town.
Hades turn to the heroes for help after Gold and Peter abduct Zelena, and offers their freedom in return. However, Cruella objects to the heroes leaving without her. In the past, Emma makes an unexpected friendship while looking for her family.
While Regina tries to convince Cora to help her stop Zelena from leaving the Underworld with Hades, James tries to get revenge on his twin brother David.
Mary Margaret and David come up with a plan for one of them to escape the Underworld. In the past, Ruby and Mulan meet Dorothy in Oz, and Ruby ends up in the Underworld and searches for Dorothy when her new ally disappears.
Belle forbids Gold from using dark magic to protect their unborn child, while Hades encourages Gaston to kill Gold. In the past, Belle and Gston fall in love as the Ogres attack.
Thanks to Gold's portal spell, the Underworld receives three new visitors. Meanwhile, David and Mary Margaret learn of a way to contact their baby son. In the past, Hades and Zelena ally to gather the ingredients for Zelena's time-travel spell.
Emma realizes that Hook needs more than rescuing from Hades if she will ever leave the Underworld with him. In the past, the Jones brothers face servitude together but the chance for freedom arises when Captain Silver sails into a hurricane... and Hades secretly offers Liam a deal.
Gold decides to help the others find Hook so that he can return to Belle. However, he has to find his ex-wife Milah to obtain her help. In the past, Rumplestiltskin must make a deal to save Baelfire's life.
After a prisoner escapes from the Underworld prison and brings word of Hook's location to the others, Mary Margaret seeks out an old friend for help. In the past in the Enchanted Forest, a young Snow faces a challenge to her rulership when bandits threaten her people.
The group arrives in the Underworld and finds a dark counterpart to Storybrooke. While Regina deals with her mother--now the mayor of the other-Storybrooke--the others try to find Hook. In the past, Regina's father tries to convince her to turn from the path of vengeance before her soul is forfeit.
The resurrected Dark Ones seek to find living souls that they can sacrifice to guarantee that they remain in the world of the living. However, when Emma sets out to stop them, Dark Hook intervenes. In the past, Regina and Hook make a deal to eliminate each other's demons.
Events in Camelot catch up to the present as Hook becomes the Dark One and seeks revenge on Rumplestiltskin. In the present, Emma tries to turn Hook from his revenge now that he knows he shares the power of the Dark One with Emma.
The witch gives Merida an ultimatum: return the magical helm she gave to Merida's father to win in battle or face a cursed kingdom. To hep her, Merida turns to her old tutor: Mulan. Meanwhile, Arthur and Zelena quest for the same helm and the two sides cross paths.
While Emma tries to prepare Hook for the the truth of what she did in Camelot, Zelena gives birth to her child. In the past at Camelot, Emma must pay a terrible price to free Hook and the others from Arthur and Zelena's captivity.
At the Camelot of six weeks ago, one team tries to recover Excalibur, while another goes after the spark Merlin can use to reforge it. In the distant past, Merlin falls in love with a refugee named Nimue.
Six weeks earlier in Camelot, Merida brings Belle with her to help save Merida's kingdom. In the present, Emma forces Merida to try and kill Belle so that Gold will become a hero and defend his love.
In the Camelot of six weeks past, Emma tries to determine how Merlin was trapped in a tree. However, Arthur attempts to thwart Emma once she discovers the ingredient necessary to free the wizard. Meanwhile, Merida trains Gold to be the hero that Emma needs, and Henry asks Violet out for a date.moreless
Six weeks earlier, Mary Margaret is unable to convince David that Arthur poses a threat to them and takes her own steps. In the present, Emma begins a new plan to free Excalibur from the Stone. And in Camelot's past, Guinevere travels with Lancelot into the heart of darkness.
In the Enchanted Forest, Arthur insists on accompanying David to find a magic relic that would let Regina communicate with the imprisoned Merlin. In Storybrooke, Emma needs Hooks help to withdraw Excalibur from the Stone.
In flashback, the Storybrooke residents are welcomed to Camelot but things turn dangerous. In the present, Hook tries to bring Emma back to the light.
Fighting the darkness within her, Emma returns to the Enchanted Forest. Meanwhile, Regina and the others are forced to turn to Zelena for help so that they can follow their friend and aid in her struggle.