Emma (Jennifer Morrison) and Hook (Colin O'Donoghue) are at another big point in their relationship in the next episode of ABC's Once Upon a Time.

The next episode of Once Upon a Time is titled "The Brothers Jones" and aptly centers on the relationship between Hook and his brother, Liam (guest star Bernard Curry). ABC has released a plot synopsis for the new episode, revealing how Liam will get involved in the Underworld storyline.

"Finally reunited, Hook and Emma must find a way to defeat Hades so that they can return to Storybrooke with Snow [Ginnifer Goodwin], David [Josh Dallas], Regina [Lana Parrilla], Robin [Sean Maguire], Henry [Jared Gilmore] and Gold [Robert Carlyle]," the synopsis reads. "A surprise visit from Hook's departed brother Liam just might provide the lead they were looking for—others who have tried to overthrow Hades [Greg Germann] spoke of a book that contained the key to his downfall.

"Tired of watching from the sidelines, Henry secretly takes matters into his own hands while the others search for the book. Meanwhile, Hades redoubles his efforts to trap the heroes in the Underworld by playing them against one another. In flashbacks, the bond between the two young Jones brothers is tested and strengthened on a merchant ship heading into a dangerous storm."

That's not all. The promo for the upcoming episode features the tease of a scene featuring Emma realizing that Liam does not want her to be with his brother. Regina asks Emma, "He doesn't like you, does he?" referring to Liam. Emma responds that Liam doesn't think she is "good enough" for Hook.

Another scene in the promo features Emma tearfully pleading to Hook to "come home." Hook plainly responds, "Why bring me back, if I should just move on?"

This looks to be a big episode for Emma and Hook, and many "Captain Swan" shippers will be watching to see that nothing goes horribly wrong for the couple.

Once Upon a Time airs Sundays at 8 p.m. ET/PT on ABC.

Watch the promo for the next episode of Once Upon a Time here:

Tags
Once Upon A Time, Television, ABC