Belle (Emilie de Ravin) will receive some big news when she reunites with Rumple (Robert Carlyle) on ABC's Once Upon a Time.

As if Belle and Rumple haven't been through enough drama, there's even more to come on the next episode of Once Upon a Time. ABC has released a plot synopsis for the upcoming episode, titled "Our Decay," which seems to feature a lot of major developments.

"Emma [Jennifer Morrison], Snow [Ginnifer Goodwin], David [Josh Dallas], Regina [Lana Parrilla], Robin [Sean Maguire], Henry [Jared Gilmore] and Hook [Colin O'Donoghue] continue to search for a way to free everyone from the Underworld," the synopsis reads.

"At the mercy of Hades [Greg Germann], Gold creates a portal to Storybrooke, which transports Belle, Zelena [Rebecca Mader] and Baby Hood to the Underworld," it continues. "While Zelena and Regina get into a sibling squabble, Belle is reunited with Rumple only to learn some tremendously shocking news that will change her life forever. Meanwhile, Snow and David hopelessly attempt to send a message from the Underworld to their son, Neal. In flashbacks, Hades learns about Zelena's very special spell and pays her a visit in Oz with the intention of striking an alliance, but finds himself with more than just a partner in crime."

The promo for the next episode focuses entirely on Zelena's big return. Zelena tells Hades (in a flashback) that she could give him a run for his money as far as being hated. They clearly embark on a big romance, as they are seen almost kissing in one scene.

There's also a scene with Zelena in the Underworld, with our heroes surrounding her. An urgent Robin tells her, "You need to tell us exactly what happened with you and Hades." Zelena is then seen visibly shaken.

With Belle and Zelena seemingly in dire straits, this is bound to be a very dramatic episode of the series.

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:

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Once Upon A Time, Television, ABC