VIDEO: Watch All-New Extended Promo for ABC's ONCE UPON A TIME

Master storytellers Edward Kitsis and Adam Horowitz ("Lost," "Tron: Legacy") invite everyone to join Emma Swan, Snow White, Prince Charming, Rumplestiltskin, Hook and the Evil Queen Regina as they travel through a portal on the Jolly Roger in an effort to reach Neverland and save Henry. But Neverland is a much darker place than you remember, and in order for our heroes to accomplish their mission, they'll have to face a foe more powerful than the Dark One himself.

What does Peter Pan want with Henry? Can our heroes put aside their differences and work together? Will Aurora, Mulan and Prince Phillip be able to nurse Neal back to health and reunite him with his family? New fairytale characters will be revealed and old acquaintances will be revisited. So think of a wonderful thought... because our Neverland's going to be a fever dream that just won't break. Below, check out an extended promo for the new season!

In the season premiere episode, "Heart of the Truest Believer," as Emma, Mary Margaret, David, Regina, Mr. Gold and Hook enter Neverland to search for a kidnapped Henry, they're greeted by a school of not-to-friendly mermaids who threaten to end their search before it begins; Henry finds himself on the run from the Lost Boys with another escapee from Peter Pan's encampment; and Neal, recovering from his wounds, travels through the Enchanted Forest with Mulan in an attempt to learn the fates of Emma and Henry, on "Once Upon a Time," SUNDAY, SEPTEMBER 29 (8:00-9:00 p.m., ET) on the ABC Television Network.
Note: This episode will repeat Sunday, October 6 from 7:00-8:00 p.m., ET.

"Once Upon a Time" stars Ginnifer Goodwin as Snow White/Mary Margaret, Jennifer Morrison as Emma Swan, Lana Parrilla as the Evil Queen/Regina, Josh Dallas as Prince Charming/David, Emilie de Ravin as Belle, Colin O'Donoghue as Hook, Michael Raymond-James as Baelfire/Neal Cassidy, Jared S. Gilmore as Henry Mills and Robert Carlyle as Rumplestiltskin/Mr. Gold.

Guest starring are Sarah Bolger as Aurora, Jamie Chung as Mulan, Julian Morris as Prince Phillip, Ethan Embry as Greg Mendell, Sean Maguire as Robin Hood, Robbie Kay as fugitive boy, Sonequa Martin-Green as Tamara, Parker Croft as Felix, Natasha Wilson as mermaid, Dave Mathews as doctor and Joy Castro as nurse.

"Heart of the Truest Believer" was written by Edward Kitsis & Adam Horowitz and directed by Ralph Hemecker.

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