The trailer of the hotly anticipated season four of "Once Upon a Time" has just been released and, it is cool.

The trailer features Elsa of "Frozen" walking through the town of Storybrooke, leaving a trail of ice wherever she treads.

Elsa will be played by Gerogina Haig of "Fringe" fame.

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The clip begins with a voiceover which says "This September, winter comes early ... When the town of Storybrooke gets frozen over."

Other characters will be shaken up with her arrival as we see Mary Margaret/Snow White, played by Ginnifer Goodwin, and David/Charming, played by Goodwin's husband Josh Dallas, taking out their weapons as they see Elsa.

Captain Hook, played by Colin O'Donoghue looks at her suspiciously as his hook freezes as she passes.

Regina/Evil Queen, played by Lana Parilla and, Emma, played by Jennifer Morrison, also notice the new arrival and the iciness in her trail. The Evil Queen comments,"Here we go again," followed by Emma's shocked "Really?"

Elsa, whose face isn't shown on the clip, isn't the only "Frozen" character to find a way to Storybrooke. Her sister Anna, played by Elizabeth Lail, will also be joining the cast, as well as Kristoff played by Scott Michael Foster, Prince Hans played by Tyler Jacob Moore and, the Troll King played by John Rhys-Davies.

Executive producer Adam Horowitz shared that they production team was excited to take in the "Frozen" universe, sharing, "We fell in love with [the movie] when it came out last year like everyone did, and we want to do our best to do it justice."

Another Disney character is returning to the series as well. Kristen Bauer Von Stratten will be reprising her role as Maleficent.

Von Stratten is known for her role in "True Blood" as the vampire henchwoman Pan.

It is unclear though is Von Stratten will only guest star in the series or will continue on as a recurring character or series regular.

"Once Upon a Time" Season 4 will premiere on Sept. 28 on ABC.

TagsOnce Upon A Time, Elsa, Frozen, Trailer