An old storyteller falls into a well and meets a group of leprechauns. The leprechauns give him three wishes to get his life together.

After Regina crushes the heart of her Dark Half, it appears Storybrooke will finally enjoy an era of tranquility. But this reprieve is short-lived when the Evil Queen reemerges and wreaks a level of havoc and terror that makes her previous cruelties pale by comparison. Desperate to right her counterpart's wrongs, Regina fights the ultimate battle against her nemesis, but can one survive if the other is destroyed?

Soon after Emma and Hook unwittingly bring Elsa of Arendelle to Storybrooke, they encounter the mysterious "Snow Queen," whose relentless obsession with both Emma and Elsa has chilling consequences. Meanwhile, it appears Regina has at last found true love with Robin Hood, but how will she react when her happy ending is thwarted yet again by a maddening, seemingly pre-ordained twist of fate?