Things are not looking good for Snow (Ginnifer Goodwin) and Charming (Josh Dallas) in the final episodes of Once Upon a Time season 4.

Regina Doesn't Trust Mother's Intentions In New 'Once Upon a Time'

Snow and Charming have certainly seen better days, considering their big secret involving Lily and Emma in the past has been revealed. Now, Dallas is previewing something shocking to come for the characters ahead.

Dallas spoke with E! News recently to preview the shocking events.

Will Regina Find Her 'Happy Ending' In The 'Once Upon a Time' Finale?

"There's big stuff going down, things that are going to shock the fans, things that a lot of the characters, particularly Snow and Charming, something that they don't want to happen," Dallas said.

Things take a dark turn as the process of reuniting adult Lily (Agnes Bruckner) with her mother Maleficent (Kristin Bauer van Straten) doesn't go as planned.

"Lily's not going to be too happy with Snow and Charming," Dallas said.

Plenty of drama is previewed in the promo for next week's episode, which is titled Mother.

"So how are we gonna get revenge on Snow White and Prince Charming?" Lily says in the promo.

Meanwhile, 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.

Some are speculating that the dragon might be Lily.

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