Maleficent (Kristin Bauer van Straten) and Lily (Agnes Bruckner) are reunited in the next episode of ABC's Once Upon a Time.

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ABC has released a promo for next week's new episode of Once Upon a Time, which is appropriately titled Mother.

In the promo, Maleficent is finally reunited with Lily after all these years.

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"Maleficent, this is your daughter," Emma (Jennifer Morrison) tells her. "This is Lily."

The promo then cuts to Lily plotting.

"So how are we gonna get revenge on Snow White and Prince Charming?" she says.

Meanwhile, the promo also teases Regina (Lana Parrilla) confronting The Author (Patrick Fischler).

"This says my happy ending is possible, doesn't it?" Regina says, holding a photo of her and Robin (Sean Maguire).

Mr. Gold (Robert Carlyle) then ominously says, "It's time villains finally win."

The end of the promo features a dramatic scene in which a dragon is going up against Snow.

Snow is knocked on her head on a rock, at which point the dragon is seen breathing fire down upon the ground.

There is some speculation that the dragon might be Lily, considering Maleficent is shown with Charming running towards Snow.

The voiceover teases that there is only one episode left before the "series-changing" season finale, which could suggest something big happening to Snow, one of the show's main characters from the beginning.

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