Emma, teamed with the entirety of her expansive family unit, arrives in the Underworld on a mission to rescue Hook, only to discover that the search will be more difficult than originally anticipated. The inhabitants of the Underworld - a conglomeration of souls with unfinished business, many of whom harbor quite personal vendettas - hound our heroes at every turn. Meanwhile, in the fairytale land that was, a familiar face from the Evil Queen's past returns to present her with the perfect birthday gift.