Queen Elsa from the celebrated movie, 'Frozen,' will be making her appearance in 'Once Upon A Time' Season 4, and though fans of the animated movie will cheer with delight, there is one character who's less than happy with the arrival of the ice princess.

Based on the trailer released as a sneak peek before the next season's air date, Evil Queen Regina will be threatened by Elsa's arrival in Storybrooke, especially since Elsa will start a friendship with Emma Swan.

Once Upon A Time creators Adam Horowitz and Eddy Kitsis revealed that the friendship fostered between Elsa and Emma will be one of the new season's main points mainly due to the personal similarities between the two.

"I think you're going to see that Elsa and Emma are going to have a friendship that we're going to see play out. I think we're going to realize that they have a lot in common but the Frozen arc is definitely going to be affecting everybody," Kitsis told in an interview with TV Fanatic.

"What happens when Elsa, who is somebody who wanted to run away, meets another character who loves to run away, Emma?," Kitsis added.

The Once Upon A Time Season 4 premiere air date is scheduled for September 28, 8 p.m. ET on ABC.