The Evil Queen decides to cast her dark curse, to ensure she gets her Happy Ending. All magic, however, comes with a price. A man she had feelings for, and develops stronger feelings for, during the curse, Killian Jones, doesn't remember her one bit.
The curse has made him bitter, in this world, bitter and alone, and closed off to forming a relationship. Regina must work to undo her own curse, by finding the Savior, if she wants to have a chance at her real happy ending.
The Dark Curse broken everyone remembering their previous lives. Evie's true origins revealed to the heroes. While Regina realizes she's got a lot to lose when she regains her magic will she be Evil Queen again or forgo all for Henry and Evie. During the whole journey Evie will have to decide should she be evil or good like she was before she died as The First Savior or succumb to the darkness forever.