5 Questions About the Frozen Storyline on Once Upon a Time

This development is what sets the sisters' separation in motion: Anna heads out on her own to figure out what her parents were in search of, and Elsa stays behind . . . only to get sucked into Storybrooke. The question now is, when will they reunite? Will it take their whole arc to see these two living it up on the streets of Storybrooke together? And will we top off their appearance with Kristoff and Anna's wedding? And speaking of Kristoff . . .