'Once Upon a Time' Winter Finale Sneak Peek

The winter finale of OUAT airs Sunday at 8 p.m. ET/PT.

The Dark Ones prepare to obliterate light magic once and for all in this week's episode of Once Upon a Time ("Swan Song"), airing Sunday, December 6 at 8 p.m. ET/PT.

The dark siege of Storybrooke is underway as all of the resurrected Dark Ones target a living soul for sacrifice so that they can return to the realm of the living. With doom imminent, Gold advises Mary Margaret, David and the rest of the heroes to spend their last fleeting moments enjoying the company of their loved ones. Emma, however, refuses to give up, knowing that she is responsible for righting all the poor choices she made as Dark One - there's only one problem, Dark Hook. When they face-off with the fate of Storybrooke at stake, Hook's actions will devastate Emma in a way no one saw coming. In a Fairy Tale Land flashback, the Evil Queen tests Hook's mettle by forcing him to confront a demon from his past before contracting him to dispatch one from hers.

Watch a sneak peek below:

'Once Upon a Time' Sneak Peek: Broken Heart

Sean Maguire, Lana Parrilla and Rebecca Mader. Photo Credit:
ABC/Eike Schroter

The fate of Storybrooke hangs in the balance when Emma and Hook's relationship is tested as never before in this week's episode of Once Upon a Time ("Broken Heart"), airing Sunday, November 29, starting at 8 p.m. ET/PT.

In a Camelot flashback, Hook becomes a Dark One and his lust for revenge against Rumplestiltskin is reignited. When Emma and Hook disagree about their best course of action, the final pieces of the puzzle are revealed as events in Camelot catch up to the present and we witness a charged confrontation between the forces of light and dark that sends our heroes on a collision course with destiny. Meanwhile, in Storybrooke, Hook's centuries old lust for revenge against Gold puts both of their fates in jeopardy while Emma's love faces the ultimate test as she tries to convince Hook to turn away from the darkness before she, Mary Margaret, David and Regina embark on a new mission as an unsuspected evil is released.

Watch a sneak peek below:

'Once Upon a Time' Sneak Peek: Merida Meets Mulan

"You may not need a man to teach you how to fight, but you can
learn a thing or two from me," Mulan tells Merida.

The heroes' Camelot quest culminates with an impossible decision Emma must make in a special two-hour Once Upon a Time event, airing Sunday, November 15, starting at 8 p.m. ET/PT.

The back-to back episodes begin with "Birth," as tensions in Camelot come to a head when Merlin, now under Arthur's control, delivers an ultimatum to Emma: hand over the Dark One dagger and the Promethean spark or he will kill her entire family. Refusing to give in, Emma and our heroes face off against Arthur, Merlin and Zelena in an epic battle of magic and will. Just when the end is in sight, Emma is forced to make a gut-wrenching choice that no one saw coming. Back in Storybrooke, Zelena's pregnancy mysteriously accelerates and Hook goes to new and desperate lengths to get answers from the Dark Swan.

In the second hour, "The Bear King," Zelena and Arthur journey to DunBroch on a mission to retrieve an enchanted relic that will provide the advantage they need to vanquish Emma and our heroes. Their path will cross with Merida's, who is on a journey of her own to pay a debt that her father, King Fergus, owed to the Witch when he died. Merida enlists the help of two friends, Mulan and Ruby, but, in order to satisfy the Witch and save DunBroch, she first must discover the identity of the knight who killed her father. In flashbacks, Merida learns about bravery and honor as she trains for combat and rides alongside Fergus into the infamous battle that claims his life.

Watch a sneak peek below:

'Once Upon a Time' Preview: Can Emma Be Saved?

Hook wants specifics about the plan to save Emma.

Emma and Merlin embark on a perilous quest to retrieve Prometheus' fire from the birthplace of dark magic on this week's new episode of Once Upon a Time ("Nimue"), airing Sunday, November 8 at 8 p.m. ET/PT.

In Camelot, Merlin spearheads a mission to reunite the dagger with Excalibur so he can use the weapon to save Emma from the darkness threatening her soul. With Zelena in tow, Hook, Mary Margaret, David, Regina and Robin steal into Arthur's castle to take the broken sword from the maniacal king. Meanwhile, Merlin brings Emma along on a journey to confront his ancient nemesis and retrieve the sacred spark he'll need to reforge Excalibur. Both parties are tested, but one suffers a blow that could derail the entire operation.

In a flashback to long before the Age of Arthur, young Merlin finds purpose after he is blessed with magic and immortality, but when he falls in love with a young refugee named Nimue, everything changes for Merlin, as their romance starts a chain of events that touches every one of our present day heroes.

In the sneak peek below, Hook, Mary Margaret, David, Regina and Robin gather to find out how to save Emma from the darkness threatening her soul.

'Once Upon a Time' Preview: Merida Breaks Out of Jail

Paul Telfer (left) as Lord Macintosh on Once Upon a Time.

Days of our Lives alum Paul Telfer (ex-Xander Cook) guest stars as Lord Macintosh on this week's episode of Once Upon a Time ("The Bear and the Bow"), airing Sunday, November 1 at 8 p.m. ET/PT on ABC.

In a Camelot flashback, a chance encounter with Merlin, David, Hook and Belle gives Merida new hope in her quest to save her brothers from the usurping clans of DunBroch. Unwilling to leave anything up to fate, Merida brings Belle along on a dangerous journey that culminates with an invaluable lesson in bravery.

In Storybrooke, Regina, Mary Margaret and David discover the spell that would allow one of Merlin's chosen to communicate with him, but when Arthur fails to reach the missing sorcerer the heroes grow suspicious. Meanwhile, Emma commands Merida to kill Belle in hopes of forcing Mr. Gold's heroic transformation. With Merida unable to disobey Emma's orders, Gold must find the courage to fight for Belle's life or risk losing her forever.

In the sneak peek below, Merlin (Elliott Knight), David (Josh Dallas), Hook (Colin O'Donoghue) and Belle (Emilie de Ravin) sneak into the dungeon at Arthur's castle to free Merida (Amy Manson) and Lancelot (Sinqua Walls).

'Once Upon a Time' Preview: Henry Turns to Dark Swan for Help

Jared Gilmore plays Henry on Once Upon a Time.

Once Upon a Time Season 5 continues with a new episode ("Dreamcatcher") on Sunday, October 25 at 8 p.m. ET/PT on ABC.

In Camelot, as Mary Margaret and David attempt to retrieve the Dark One dagger, Emma uses a dreamcatcher to look into the past to see how Merlin was transformed into a tree. Together, Emma and Regina figure out the critical ingredient they must acquire to free Merlin, but it's a race against Arthur, who does not want Merlin released. Meanwhile, with encouragement from his moms, Henry musters up the courage to ask Violet on a date. Back in Storybrooke, the heroes break into Emma's house hoping to locate Gold, but what they find will give them a glimpse of Emma's end game. Far from prying eyes, Merida sets about the mission Emma has tasked her with and begins molding Gold into the hero they need to draw Excalibur.

In the sneak peek below, when Henry sees his crush Violet's sadness over her missing horse, he turns to the one person he knows can help: Emma.

'Once Upon a Time' Preview: Regina Makes a Promise to Zelena

Regina (Lana Parrilla) allows a muted Zelena (Rebecca Mader) to speak.

Once Upon a Time Season 5 continues with a new episode ("Siege Perilous") on Sunday, October 11 at 8 p.m. ET/PT on ABC.

In Camelot, the heroes feverishly work to free Merlin. Determined to help Emma, David embarks on a quest to retrieve a magical relic that Regina could use to communicate with the imprisoned sorcerer, but, when David leaves, Arthur insists on joining him because the dangers ahead are greater than he can imagine. Meanwhile, Mary Margaret discovers the fate of her old friend Lancelot. Back in Storybrooke, Arthur seeks David's help to catch a thief who threatens the safety of the citizens of Camelot. Across town, Emma reaches out to a conflicted Hook as she sets about her plan to draw Excalibur from the stone

In the sneak peek below, Regina (Lana Parrilla) allows a muted Zelena (Rebecca Mader) to speak and confronts her sister about taking away Robin's (Sean Maguire) baby.

'Once Upon a Time' Preview: The Heroes Continue Their Search for Merlin

Robin (Sean Maguire) and Regina (Lana Parrilla).
Photo Credit: ABC/Jack Rowand

Once Upon a Time Season 5 continues with a new episode ("The Price") on Sunday, October 4 at 8 p.m. ET/PT on ABC.

In an effort to protect Emma, Regina steps up in a surprising way that will test her mettle as a force for good. King Arthur and Queen Guinevere throw a royal ball to welcome the heroes to Camelot, but when the celebration takes a deadly turn, David and Robin must leap into action or lose a crucial asset in the fight to save Emma. Back in Storybrooke, Hook deploys a tried-and-true technique in hopes of bringing Emma back to the light while the heroes discover that some unexpected baggage has followed them home from Camelot.

Watch a sneak peek below. While the citizens of Camelot settle into camp in Storybrooke, Regina turns to Robin when something Emma said disturbs her.

'Once Upon a Time' Season 5 Premieres September 27

Jennifer Morrison and Robert Carlyle.  Photo Credit: ABC/Jack Rowand

Season 5 of Once Upon a Time premieres Sunday, September 27 at 8 p.m. ET/PT on ABC.

Immediately after becoming the Dark One, Emma disappears and the heroes must band together to save her, but first they have to find her, which will require the help of an unlikely ally. Meanwhile, in the Enchanted Forest, Emma struggles to resist her dark urges as she searches for Merlin in the hope that he can stop her transformation. Along the way to Camelot, she gets help from the plucky and brave warrior princess Merida, as well as King Arthur and his Knights of the Round Table.

Watch a sneak peek below:

'Once Upon a Time' Winter Finale Sneak Peek

Elsa and Anna need to get back to Arendelle to save their kingdom from Hans and his brothers.

Anna and Elsa return to Arendelle, and old friendships are renewed on the winter finale ("Heroes and Villains") of Once Upon a Time, airing Sunday night at 8 p.m. ET/PT on ABC. Kristin Bauer van Straten (True Blood), Merrin Dungey (Revenge), Victoria Smurfit (Dracula) guest star.

In the aftermath of the Snow Queen's spell, our heroes try to pick up the pieces and Regina has to make a difficult choice. Hook's fate hangs in the balance as Gold's quest for power threatens everything he holds dear. And, in the Enchanted Forest flashback, an intrusion during Belle's stay at Rumplestiltskin's dark castle will wreak havoc in both the past and the future.

Watch a sneak peek of "Heroes and Villains" below:

'Once Upon A Time' Two-Hour Season Finale Preview

Colin O'Donoghue and Jennifer Morrison.
Photo Credit: ABC/Katie Yu

Season 3 of ABC drama Once Upon A Time concludes with back-to-back episodes ("Snow Drifts" and"There's No Place Like Home") on Sunday, May 11, starting at 8 p.m. ET/PT.

While Mary Margaret and David celebrate the naming of their son at a coronation in Granny's Diner, Emma and Hook are pulled into Zelena's time portal and find themselves in the Enchanted Forest of the past. But in their quest to discover a way back, they must be careful not to change ANYTHING or risk altering the lives of their friends and family -- as well as their very own existence.

Watch a sneak peek video from the Once Upon A Time season finale below:

'Once Upon A Time' Preview: In the Land of Oz of the Past, A Young Girl From Kansas Threatens to be Zelena's Undoing

Rebecca Mader, Sunny Mabrey and Matreya Scarrwener.
Photo Credit: ABC/Katie Yu

Season 3 of ABC drama series Once Upon A Time continues on Sunday, May 4 at 8 p.m. ET/PT.

In the episode, "Kansas" with Mary Margaret in labor and due to give birth at any moment, the residents of Storybrooke go on high alert in an attempt to ensure that Zelena doesn't try to steal her newborn baby for use in her ultimate game plan to turn back time and change her destiny -- while obliterating Regina's existence.

Meanwhile, in the land of Oz of the past, Glinda tries to convince Zelena to fight her evil tendencies and join her and her sister witches as a protector of Oz. But the appearance of a young girl from Kansas could turn out to be her undoing.

Watch a sneak peek video below:

'Once Upon A Time' Preview: Snow and Charming Go In Search of Good Witch Glinda

Sunny Mabrey as Glinda. Photo Credit: ABC/Jack Rowand

Season 3 of ABC drama series Once Upon A Time continues on Sunday, April 27 at 8 p.m. ET/PT.

In the episode, "A Curious Thing," Zelena threatens to kill Henry if Hook - whose lips have been cursed by the Wicked Witch -- doesn't proceed with kissing Emma, which will drain all of her magical powers away, and things begin to heat up between Regina and Robin Hood. Meanwhile, back in the Fairy Tale Land that was during the past year, Snow and Charming go in search of Glinda, the Good Witch of the South, to see if she can help them defeat Zelena, and the curse that will ultimately send the Fairy Tale characters back to Storybrooke is cast -- but from an unlikely source.

Watch a sneak peek video below:

ONCE UPON A TIME "Witch Hunt" Preview

Ginnifer Goodwin. Photo Credit: ABC/Jack Rowand

Emma discovers that the Storybrooke residents have no memory about how they returned to the town, their past year back in fairy tale land, or who was responsible for the new curse on a new episode of ONCE UPON A TIME, airing Sunday, March 16 at 8 p.m. ET/PT.

Emma arrives in Storybrooke with Henry and reunites with her friends and family, only to discover that no one remembers how they were transported back - or the past year they had spent back in Fairy Tale Land. But Emma is sure that someone in town is responsible for this new curse and teams up with Regina in an attempt to uncover their identity. Meanwhile, in the Fairy Tale Land that was during the past year, Regina, with the aid of Robin Hood, attempts to break into her castle, which has been overtaken by the Wicked Witch.
Watch a sneak peek video below:

ONCE UPON A TIME "New York City Serenade" Preview

Jennifer Morrison and Colin O'Donoghue.
Photo Credit: ABC/Jack Rowand

The third season of ONCE UPON A TIME continues with a new episode ("New York City Serenade") on Sunday, March 9 at 8 p.m. ET/PT on ABC.

After Rumplestiltskin sacrificed his life to stop Pan from enacting another curse, Regina obliterated her original curse, which erased Storybrooke from existence and whisked its residents back to Fairy Tale Land - leaving Emma and Henry back in our world with no memories of Storybrooke. But all is not well back in the Enchanted Forest when Hook comes calling on Emma in New York City in an attempt to jog her memory so that she can once again help her fairy tale family and friends out of a desperate situation.

Watch a sneak peek video below:

ONCE UPON A TIME Winter Finale Sneak Peek

Colin O'Donoghue, Michael Raymond-James, Rose McIver and
Josh Dallas. Photo Credit: ABC/Jack Rowland

The third season of ONCE UPON A TIME continues with a new episode ("Going Home") on Sunday, December 15th at 8 p.m. ET/PT on ABC.

In the Winter Finale, the race is on to stop Pan from enacting another curse on the residents of Storybrooke, which could kill every living soul in town.

Note: ONCE UPON A TIME returns with all new episodes for its Spring Premiere on Sunday, March 9.

Watch a sneak peek of "Going Home" below:

ONCE UPON A TIME "The New Neverland" Sneak Peek

Photo Credit: ABC/Jack Rowland

The third season of ONCE UPON A TIME continues on Sunday, December 8th at 8 p.m. ET/PT on ABC with a new episode, "The New Neverland."

The residents of Storybrooke are overjoyed upon the return of Henry and our heroes from Neverland. But unbeknownst to them, a plan is secretly being put into place by a well-hidden Pan that will shake up the very lives of the townspeople.

ONCE UPON A TIME "Think Lovely Thoughts" Sneak Peek

Photo Credit: ABC/Jack Rowland

The third season of ONCE UPON A TIME continues on Sunday, November 17th at 8 p.m. ET/PT on ABC with a new episode, "Think Lovely Thoughts."

Pan leads Henry to a secret cave, where he has convinced the boy that he alone can save magic and Neverland itself. But a showdown between good and evil is about to go down as Emma, Mary Margaret, David, Regina, Mr. Gold and Hook find themselves directly on a path to Pan in an effort to save Henry.

ONCE UPON A TIME "Dark Hollow" Sneak Peek

Photo Credit: ABC/Jack Rowland

The third season of ONCE UPON A TIME continues on Sunday, November 10 at 8 p.m. ET/PT on ABC with a new episode, "Dark Hollow."

Mr. Gold and Regina send Ariel back to Storybrooke with an item that will allow Belle to locate a hidden artifact that could help take down Pan. But unbeknownst to them, two men have broken into the town with the intent to stop them - at all costs.

Meanwhile, Emma, Neal and Hook attempt to find Dark Hollow, where Peter Pan's shadow dwells, in order to capture it, and Mary Margaret is upset with David for keeping his poisoning a secret from her.

Watch a sneak peek below:

ONCE UPON A TIME "Ariel" Sneak Peek

JoAnna Garcia Swisher as Ariel. Photo Credit: ABC/Jack Rowland

The third season of ONCE UPON A TIME continues on Sunday, November 3 at 8 p.m. ET/PT on ABC with a new episode, "Ariel."

Back in the Fairy Tale Land that was, when Ariel (JoAnna Garcia Swisher) saves Snow White from drowning in the ocean's depths, Snow returns the favor by helping her new friend get acquainted with Prince Eric, with whom she has fallen madly in love.