EMMA, SNOW, CHARMING, RUMPLESTILTSKIN, HOOK AND REGINA ENTER NEVERLAND TO SAVE HENRY BUT ARE GREETED BY A SCHOOL OF NOT-SO-FRIENDLY MERMAIDS WHO THREATEN TO END THEIR SEARCH BEFORE IT BEGINS, AND NEAL - WITH MULAN'S AID IN THE ENCHANTED FOREST - TRIES TO DISCOVER THE FATES OF EMMA AND HENRY, ON ABC'S "ONCE UPON A TIME"

"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, OCTOBER 6 (7:00-8:00 p.m., ET) on the ABC Television Network. (Rebroadcast. OAD: 9/29/13)

"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.

"Once Upon a Time" is broadcast in 720 Progressive (720P), ABC's selected HDTV format, with 5.1 channel surround sound. This program carries a TV-PG,V parental guideline.

For more information on "Once Upon a Time," visit ABC.com/Once