ARIEL PLEADS WITH HOOK TO HELP HER FIND PRINCE ERIC, AND EMMA AGREES TO LET REGINA TEACH HER HOW TO USE MAGIC TO HELP DEFEAT ZELENA, ON ABC'S "ONCE UPON A TIME"

JoAnna Garcia Swisher Guest Stars as Ariel

"The Jolly Roger" - Ariel returns to Storybrooke and pleads with Hook to help her find Prince Eric, who never returned to the town when the new curse was invoked. Emma agrees to let Regina teach her how to use magic so that she can help defeat Zelena, and Mary Margaret and David try to prove that they can be just as much fun as Hook is with Henry -- who thinks they are boring. Meanwhile, in Fairy Tale Land during the past year, an angry Ariel confronts Hook over her missing Prince Eric, who she assumes was kidnapped and possibly killed by the swarthy pirate. But when Hook confesses that the Jolly Roger has been stolen and Eric is most likely the thief's prisoner, Ariel unknowingly provides him with a clue as to who the culprit is, and Hook - with Ariel in tow - goes off in search of his ship, on "Once Upon a Time," SUNDAY, APRIL 13 (8:00-9:00 p.m., ET) on the ABC Television Network.

"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 Beverley Elliott as Granny, Rebecca Mader as Zelena, Christopher Gauthier as Smee, JoAnna Garcia Swisher as Ariel, Gil McKinney as Prince Eric, Charles Mesure as Black Beard, JC Williams as lead guard and Jessa Danielson as wench.

"The Jolly Roger" was written by David H. Goodman and directed by Ernest Dickerson.

"Once Upon a Time" is broadcast in 720 Progressive (720P), ABC's selected HDTV format with a 5.1 channel surround sound. A TV parental guideline will be assigned closer to the airdate.

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