"Once Upon A Time" season 4 spoilers reveal the return of the evil Maleficent who will again wreck chaos on Storybrooke. Meanwhile, Elizabeth Mitchell's role remains a mystersy.

According to Entertainment Weekly's "Once Upon A Time" season 4 spoilers, Kristin Bauer van Straten will return to reprise her role as Maleficent, the evil queen who was portrayed by Angelina Jolie in the recent Disney movie.

It would be interesting how she will make her grand entrance after having come back as a zombie in season 2. It can be recalled that Emma Swan already killed Maleficent at the final episode of season 1 after the evil queen was locked in a deep cavern.

The magazine wondered whether Maleficent would be the show's big villain when the "Frozen" story arc concludes.

"It's unclear as of now, but Bauer will be back as a recurring guest star for a big arc, so here's hoping this means the show will dive more into her past, as well as Aurora's history," the magazine said.

The E! News last month has revealed "Once Upon A Time" season 4 spoilers when it confirmed the casting of Elizabeth Mitchell of "Lost Revolution".

"Mitchell's character may be a villain and will have ties to the 'Frozen' characters 'Once Upon a Time' is bringing in for the upcoming fourth season," the website said.

But the Bustle website suggested the Mitchell could in fact be Queen Elsa's long-thought to be dead mom, noting her resemblance to Elizabeth Lail, who plays Princess Anna in "Once Upon A Time."

It also noted the photo uploaded on social media showing Elizabeth Mitchell wearing a sparkling white gown.

"Lail and Mitchell look strikingly similar. Maybe it's coincidence. Maybe it's intentional. Either way, the dress Elizabeth is wearing on set is too sparkly for her NOT to be a queen," it said.