Followers of the fairytale based drama, "Once Upon A Time" will be in for a major shock in Season 5.

As per International Business Times, apart from Jennifer Morrison's character Emma Swan, followers of the hit ABC show will also see Ginnifer Goodwin's Snow White unleash her dark side. She will also exhaust all her efforts to bring back her daughter Emma, The Dark Swan, back into the light.

Until Emma Swan's return however, the new savior of Storybrooke will be Evil — at least, formerly — Queen Regina Mills.

Lana Parilla who portrays Regina Mills revealed to Buddy TV, "I think Regina's going to become the savior and the hero this year. We don't know what's going to happen, and Regina is very experienced when it comes to sort of crossing over into the dark side and committing evil acts."

She continued on that the Evil Queen is worried about the future of Emma Swan as she trusts that "the savior may never return back to her true self."

Meanwhile, as per Realty Today, Josh Dallas whose character is Prince Charming, dished out to Entertainment Weekly on the possibilities that will happen to his relationship with Snow White in "Once Upon A Time" Season 5.

As it was revealed that their daughter, Emma Swan, will be the newest antagonist of Season 5, the love between Prince Charming and Snow White will be tested.

The actor said, "It is definitely going to put a strain on Snow and Charming's relationship. There are things they are going to go through in finding their way back to Emma."

Aside from the focus on strained relationships, "Once Upon A Time" Season 5 will also highlight the friendship of Prince Charming and King Arthur played by Liam Garrigan, who will both embark on a journey to Camelot, as per International Business Times.

"Once Upon A Time" Season 5 will also present new characters such as Joanna Metrass as Queen Guinevere and Elliot Knight as Merlin or the Sorcerer.

In the meantime, how will Hook react to Emma crossing over to the dark side?

According to actor Colin O'Donoghue, "It's really difficult for Hook, because he spends most of the last season trying to protect her from the darkness, because he understands what that means. Certainly he's trying to protect her heart," as per Pop Sugar.

Catch the premiere of "Once Upon A Time" Season 5 on ABC on Sept. 27, Sunday, on 8|7c.

In the meantime, watch the trailer below and get a glimpse on what's to come in Storybrooke.