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Episode 4x01: A Tale of Two Sisters (Sep/28/2014)
Regina deals with the repercussions of losing Robin after Emma brings his wife from the past, and turns to an friend for help. Meanwhile, a mysterious ice princess arrives in Storybrooke and unleashes chaos. In the past in the kingdom of Arendelle, Elsa and Anna discover that their parents were killed trying to find a cure for Elsa's condition, and Anna sets out to find the same cure.

Episode 4x02: White Out (Oct/05/2014)
Elsa traps Storybrooke within a wall of ice while trying to find Anna, but is unable to release them... and puts Emma's life in danger. Meanwhile, when the power goes out, the townspeople insist that Mary Margaret deal with the crisis. And in the past, Anna visits David and helps him learn how to fight so that he can defeat the dreaded warlord Bo Peep.

Episode 4x03: Rocky Road (Oct/12/2014)
Marian falls under a freezing curse and the townspeople believe that Elsa is responsible. When Emma and David go to Robin's camp to look for clues, they find Will Scarlet, who leads them to the culprit. Meanwhile, in the Arendelle of the past, Elsa and Kristoff go to find the urn that Hans plans to use to imprison Elsa, and encounter the Snow Queen.

Episode 4x04: The Apprentice (Oct/19/2014)
To prepare for his first real date with Emma, Hook blackmails Gold into restoring his left hand. However, the pawnbroker warns that all magic comes with a price. Meanwhile, Will tries to steal a book from the library. In the Enchanted Forest of the past, Anna has no choice but to agree to do a favor for Rumplestiltskin return for knowledge of why her parents traveled to see the Dark One.

Episode 4x05: Breaking Glass (Oct/26/2014)
Emma tries to convince a reluctant Regina to help her find the Snow Queen, only to discover that Regina is lying to her about Sidney's whereabouts. Meanwhile, David convinces Mary Margaret to go on a date, but the date turns into a hunt when Will escapes his jail cell. In the past, Emma befriends another young orphan who isn't all that she seems.

Episode 4x06: Family Business (Nov/02/2014)
While Emma and Regina track down the Snow Queen's ice cream truck and find a clue to her connection to Emma, Belle sets out to right a wrong that she did to Anna long ago... by using Gold's dagger to compel him to help. In the past, Anna agrees to take Belle to Grand Pabbie to restore her memories of what happened to Belle's mother.

Episode 4x07: The Snow Queen (Nov/09/2014)
Emma and Elsa manage to capture the Snow Queen, unaware that she wants to be captured so that she can play on Emma's self-doubts. Meanwhile, Robin chooses between Regina and Marian, and Henry attempts to learn the secrets of his grandfather's pawnshop. In the past, Ingrid learns of her powers and her sisters Helga and Gerda vow to stand by her no matter what.

Episode 4x08: Smash & Mirror Part 1 (Nov/16/2014)
Gold manages to imprison the Snow Queen and plans to strip Emma of her light magic for his own purposes. Meanwhile, Robin asks Will to help him find the storybook's author, and Emma grows increasingly frantic as her powers run out of control. In the past, Elsa frees Anna and together they try to trap Ingrid within the urn.

Episode 4x09: Smash & Mirror Part 2 (Nov/16/2014)
Gold continues with his plan to use the Sorcerer's Hat against Emma so that he can free himself from the Dark One's dagger. Meanwhile, Regina isn't convinced that she will ever find her happy ending, but Mary Margaret convinces her otherwise. In the past, Ingrid turns Anna against Elsa and learns what she must do to obtain her third sister.

Episode 4x10: Fall (Nov/30/2014)
The Snow Queen unleashes her spell, and the townspeople try to prepare a cure before sundown. Gold forces Hook to use the Sorcerer's hat to drain the fairies of their power and use it to escape Storybrooke himeslf. Meanwhile, Elsa and Emma try to find Anna, who may hold the cure to the town's survival. In the past, Anna and Kristoff seek out Black Beard to obtain the Wishing Star that will let them free Elsa from the urn.

Episode 4x11: Shattered Sight (Dec/07/2014)
As Storybrooke descends into chaos as the Snow Queen's spell takes hold, Emma and Elsa try to trick Regina into destroying the ribbons so that they can attack the Queen. In the past, Ingrid adopts Emma and attempts to show the girl that she's a powerful sorceress.

Episode 4x12: Heroes and Villains (Dec/14/2014)
As Emma tries to find a way to get Elsa, Anna, and Kristoff back to Arendelle, Gold uses Hook to prepare the way for his departure from Storybrooke. In the past, the Queens of Darkness abduct Belle to force Rumplestiltskin to give them one of his magical artifacts.

Episode 4x13: Darkness on the Edge of Town (Mar/01/2015)
Gold recruits Ursula and Cruella to help him get back into Storybrooke so that they can all obtain their happy endings. Meanwhile, the townspeople try to get back to their normal routine. However, when Belle finds a way to release the trapped fairies, she unleashes an evil creature that wrecks havoc on Storybrooke.

Episode 4x14: Unforgiven (Mar/08/2015)
Mary Margaret and David try to find out what Cruella and Ursula are up to, without revealing to Emma that their pasts are intertwined with the Queens of Darkness. Meanwhile, Regina and Henry go to Pinocchiio in the hopes that he can reveal something about the Author. In the past, the reason for the Charmings' secrets is revealed.

Episode 4x15: Enter the Dragon (Mar/15/2015)
While Regina works to gain the trust of the Queens of Darkness, Gold initiates his own scheme to regain his dagger. In the past, Regina seeks out Maleficent to learn magic, but discovers that her would-be mentor is the one who needs help.

Episode 4x16: Poor Unfortunate Soul (Mar/22/2015)
While Gold tortures August for the information of the Author, Hook makes a deal with Ursula to learn Gold's plans. In the past, Hook and a young Ursula form an alliance so that each can get what they want, but Hook is forced to betray the young woman.

Episode 4x17: Best Laid Plans (Mar/29/2015)
Regina risks her cover to delay Gold from getting the page of the book. Meanwhile, Emma learns the truth from her parents, and has a change of heart. In the past, Snow and Charming take Maleficent's child to save their own, but discover that the price is more horrible than they could have imagined.

Episode 4x18: Heart Of Gold (Apr/12/2015)
Gold offers the Author refuge to avoid Emma and the others. Meanwhile, in the past, Robin is forced to undetake a job for Rumplestiltskin to save his tavern... a job that takes him to Oz.

Episode 4x19: Sympathy for the De Vil (Apr/19/2015)
Cruella abducts Henry in an attempt to force Emma and Regina to kill the author for her. In the past, a woman confines a young Cruella to the attic after the death of Cruella's father, but a mysterious reporter comes with an offer to take the girl away.

Episode 4x20: Lily (Apr/26/2015)
Regina asks Emma to go with her to New York to get Robin back from Zelena, in return for helping her find Maleficent's daughter. Meanwhile, Gold asks Will to help him steal Belle's heart back. In the past, Emma meets Lily again.

Episode 4x21: Mother (May/03/2015)
Regina and Emma return Lily to her mother, but the reunion doesn't go as planned. Meanwhile, Gold gets worse and loses Isaac to a rival. In the past, Cora tries to unite Regina with her soul mate, but has her own ulterior motive.

Episode 4x22: Operation Mongoose Part 1 (May/10/2015)
Isaac rewrites the heroes' and villains' happy endings, and finds himself a best-selling author. Henry is the only one who is unaffected, and enters Isaac's new book to try and undo what has happened and restore his family.

Episode 4x23: Operation Mongoose Part 2 (May/10/2015)
In Isaac's new reality, Henry and a cowardly Hook rescue Emma and try to reunite Regina with Robin. Meanwhile, Isaac tells Rumplestiltskin what he must do to save his happy ending.

Source: TVRage