With everyone in Storybrooke under the evil influence of Shattered Sight, Elsa and Emma go to confront Ingrid in her ice castle to settle things once and for all. However, Anna finds a letter from her late mother that could change everything.
Mirror shards of snowflakes fall over the forest.
In the Characters' Past
Ingrid arrives in Boston in 1982. She finds a psychic shop; a Fortune Teller named Madame Faustina and tries to receive her fortune, only to learn that the "seer" is a charlatan. Enraged, Ingrid attempts to freeze her, only to discover that she has no magic. She then leaves, vowing to wait as long as it takes to find Emma.
Richfield, Minnesota in 1999, Emma has just become one of Ingrid's foster children. Though Ingrid (when she was using the alias Sarah Fisher) intervenes when one of her charges steals Emma's camera, Emma attempts to leave when the bully still demands the device. Ingrid encourages Emma to stay by telling her that her bully is afraid of spiders. The two bond in the short time and Ingrid files to adopt Emma. When a carnival claw machine sparks, Ingrid believes it proof of Emma's magical talent and attempts to test it by throwing the both of them in front of an oncoming car. But this only has the effect of breaking their bond as Emma runs away.
In 2001, Ingrid travels to Maine, where she unravels the prophecy scroll and finds herself in Storybrooke. In November 2011, when Emma wanders into Ingrid's ice cream shop, she recognizes Ingrid. Ingrid attempts to convince her of Henry's claims about magic were true, only to be met with denial and anger. Ingrid then removes all memories of herself from Emma into a memory stone, hence why Emma doesn't remember her.
As everyone in Storybrooke begin to attack each other, fighting and riots break out across the town. At the sheriff's station Elsa, Emma, and Anna are trying to come up with a plan to stop Ingrid while at the same time deal with keeping Mary Margaret and David from each other's throats as long as they are separated in their jail cells. As they leave Neal with Anna, Emma and Elsa confront Ingrid at "Any Given Sundae" where their powers can't work on her due to the ribbons on them. This gives Emma an idea: to go the Vault and face Regina, who was sealed inside for her own safety.
Meanwhile, the protection spell is causing Regina to believe that Emma trapped her inside, and as she sees herself in the mirror Regina looks at her outfits, she then brings back her previous life as the Evil Queen. When Emma and Elsa arrive and unseal the Vault, they came just in time to see Regina use her pyrokinetic powers against them and they bond their arms with the ribbons on their wrist; the ribbons free Emma and Elsa, and Emma uses her powers to stall Regina from going after them. Regina, believing that Emma went to the Sheriff's station, shows up there, only to set up a battle between her and Mary Margaret. Regina then makes Anna and Kristoff disappear, and they end up on the beachfront. As Kristoff argues with Anna, she trips her leg on the bottle, which Anna picks up and hits him on his head knocking Kristoff out, allowing the letter that was inside the bottle to fall into Anna's hands, Anna then reads the letter and she races off to the Snow Queen's lair.
At her lair, Ingrid then proceeds into the next part of her plan where she restores the good memories of Emma and Elsa to them while stating that they don't have it in them to kill her. When Anna arrives with the note about her mother's last words that involved the truth of Ingrid and Helga, being Elsa and Anna's maternal aunts, while stating that Arendelle deserves to know all about Ingrid and Helga. Ingrid then begins to attack Anna by choking her to death and manages to knock her down. Upon reading the note, a tearful and repentant Ingrid sees that Anna is right as she touch the memory stone and shows memories of her sisters and begins to regret her actions. Ingrid then undoes the Spell of Shattered Sight by sacrificing her own life. Before she dies, Ingrid states that Emma has found her family and returns the lost memories of Emma and Elsa to them now that she has her own younger sisters' love. Ingrid then disappears to the afterlife where she is happy to join her beloved little sisters, Helga and Gerda, there.
Meanwhile, Hook comes to see Gold about the chaos going around Storybrooke, and as long as Gold has his heart, he tells Hook that he is immune from the curse. As Gold prepare to pack up and leave town, he needs Hook to grab Henry and meet him and Belle at the town line, since he will not use his magic to bring Henry to him but by the time he reaches New York City, Gold will make sure they will never remember any of this but explain that Storybrooke was destroyed. Hook heads to the Mayor's office to see Henry and tells him to come with him. Henry, affected by the curse, calls Hook a dirty pirate and says he didn't like him before and likes him less now he's with his mother, Emma, and asks him to leave. Hook uses the potion that Gold gave him to break the spell and he heads in, but Henry has spread marbles all around and Hook goes down, allowing Henry to flee for his safety. Hook chases him but is confronted by Will, who initiates a fist-fight. Hook knocks out Will, but the delay allows Henry to escape.
Thanks to Ingrid; the spell of shattered sight is finally broken, the shards turn into snow and Storybrooke returns to normal, including Regina and Mary Margaret, who immediately stop fighting and start laughing. Mary Margaret and David run up to Emma to hug her, while Henry runs to Regina and hugs both her and Emma. As Neal begins to wake up, David tells Mary Margaret to forget what happened under the curse, then the couple kiss. Finally, Gold checks on Belle as she is sleeping, when Hook arrived to the pawnshop and tells him Henry got away. Gold asks how he failed at kidnapping a child, only to have Hook respond to that answer by saying his heart wasn't in it. Since Gold knows that the Snow Queen's plan failed, he won't, and as he tells Hook it's his last day on earth, Hook makes a final request as a dying wish to leave Emma and the rest of Storybrooke intact. Gold says as long as Emma doesn't get in his way, she'll survive. He says once he steps over the line with his magic, they have nothing to fear from him – but says he can't make that promise for the rest of the world. Confident that he will go through with his plans, a smug but sinister Gold leaves the pawnshop to walk out into the fresh Storybrooke snowy air.
- David mentions Arendelle and says "the whole place is frozen!", referencing the film.