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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.