"Once Upon a Time" Season 3, Episode 7 is called "Dark Hollow." The Evil Queen and Rumplestiltskin send off Ariel on a Belle-related mission to Storybrooke. The Beauty and the Beast are worlds apart, but the erstwhile little mermaid is crossing realms to help them see each other again. Meanwhile, Peter Pan continues to mess with everyone in Henry's family in Neverland. After secrets were revealed in the Echo Cave, what's next in Pan's games?

Spoiler alert: This feature contains spoilers for those who have not seen the most recent episodes of Once Upon a Time Season 3. Read at your own risk.

Oncers have been enjoying OUAT Season 3 for its rich plots. Saving Henry has been quite a journey for the Jolly Roger mates. Considering Snow White (Ginnifer Goodwin), Prince Charming (Josh Dallas) and company have been gone from Storybrooke for only five days, the show has been truly eventful.

Regina, Gold Summon The Little Mermaid

JoAnna Garcia Swisher reprises her role as Ariel, the grown-up little mermaid from Under the Sea in this Sunday's Once Upon a Time Season 3, Episode 7. "Dark Hollow" brings Ariel to Storybrooke, where she has to get something that Rumplestiltskin (Robert Carlyle) and Regina (Lana Parrilla) need in order to beat Peter Pan (Robbie Kay) in Neverland. Now a spoiler photo on E! hints Pan finds his way to Storybrooke, as well.

A lot of characters in tales as old as time will be seen in "Dark Hollow." Rose McIver returns as Tinker Bell. Keegan Connor Tracy is also back as Mother Superior aka Blue Fairy. Lee Arenberg as Grumpy Leroy is also back with the rest of Snow White's seven dwarves.

The Saviour Emma Swan and Her Son's Gramps, The Dark One: Their Struggles in Neverland

Emma Swan (Jennifer Morrison) and Rumple have the most to confront in Neverland than anyone else. Emma definitely wants to save her biological son Henry, who happens to be Rumple's grandson. Their lives are opposites yet intertwining. One of them is pure in heart, doing well -- despite her sufferings -- in Pan's games. The other has been lost since Day 1 in Neverland. OUAT 3x7 "Dark Hollow" delves deeper into The Dark One's history of pains.

Emma Swan learns about Captain Hook's (Colin O'Donoghue) feelings for her. But she has yet to really process everything. Rumple discovers his son Baelfire (Michael Raymond-James) is still alive, and that paralyzes him yet again. His survival instincts are telling him he can't save Henry, his foretold undoing.

Emma admits to Mary Margaret (Ginnifer Goodwin) that she's still struggling with the feeling of being an orphan, abandoned. She later admits to Baelfire/Neal that she was not too thrilled to know he's still alive. She has to make those revelations. Otherwise, Operation Cobra aka Save Henry Team doesn't move forward in Neverland.

VIDEO: Once Upon A Time Season 3 Sneak Peek Video (YouTube)

Watch Ariel and Belle take Snow White's seven dwarves on a mission in this OUAT 3x07 (Nov. 10 episode) teaser clip below.

Once Upon a Time Season 3, Episode 7 ("Dark Hollow") airs on the U.S. network ABC this Sunday, Nov. 10. Australian viewers can catch the fantasy series on 7TWO (fast track).

More 'Once Upon a Time Season 3' and TV Guide Features:

Once Upon a Time Season 3 Spoilers: Ariel, Ursula and Peter Pan; Henry vs the Lost Boys; Captain Hook Decides after the Swan Kiss [VIDEO]
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