Season 4 spoilers for the fairy tale drama series "Once Upon a Time" suggest Storybrooke will face the Ice Queen's wrath, International Business Times reported. Also, Hook will be ditching his pirate gear for clothes more suitable for this world, TVLine said.

ABC network's brief Season 4 synopsis states that the resident fairy tale characters are preparing to defend themselves against the magical forces of the Ice Queen. The synopsis described this force as something from the past and too dark and unpredictable even for Rumplestiltskin.

Despite giving an idea of what to expect for the upcoming season, the synopsis reveals little about the Ice Queen. While the Season 3 finale teased Snow Queen Elsa's addition to the cast, she should not be confused with the Ice Queen, who fans speculate is related to the recent casting of Elizabeth Mitchell. The "Lost" actress's role has not yet been named, so she may be connected to the villainous Ice Queen.

Co-creator Adam Horowitz revealed the title of the season premiere on Twitter: "A Tale of Two Sisters," seemingly hinting the show will feature the story of "Frozen's" Elsa and Anna, the Times reported. He also hinted that the sisters might not be happily united, meaning Elsa might be introduced at her evil and misunderstood stage.

Other spoilers have mentioned the obstacles Emma and Hook will face this coming season, despite ending on a good note in Season 3. They will encounter challenges this time around, Horowitz explained.