David - aka John Doe - must choose between staying with Kathryn or leaving her to be with Mary Margaret, with whom he's fallen deeply, and inexplicably, in love; and Emma catches Sheriff Graham in a lie. Meanwhile, back in the fairytale world that was, Prince Charming is about to encounter a life-changing event that will forever alter his destiny.

While Mary Margaret and David celebrate the naming of their son at a coronation in Granny's Diner, Emma and Hook are pulled into Zelena's time portal and find themselves in the Enchanted Forest of the past. But in their quest to discover a way back, they must be careful not to change anything or risk altering the lives of their friends and family - as well as their very own existence.