'Once Upon A Time' Season 4 Air Date, Trailer & Spoilers: New Teaser Shows Elsa's Menacing Stroll in Storybrooke

For all those wondering how Queen Elsa will sweep into Storybrooke, a new trailer has been released that shows the icy trail the Arendelle Queen will bring to the fantasy town.

ABC's fourth season of "Once Upon A Time" will feature characters from last year's worldwide hit, Disney's "Frozen."

In the new trailer exclusively released to The Hollywood Reporter, Elsa, played by "Fringe" actress Georgina Haig, is seen passing through Storybrooke. The video begins with a warning voice, "This September, winter comes early. When the town of Storybrooke gets Frozen... Over."

"Naturally, her unwelcome presence puts everyone - from Mr. Gold/Rumpelstiltskin (Robert Carlyle) and Mary Margaret/Snow (Ginnifer Goodwin) to David/Charming (Josh Dallas) and Captain Hook (Colin O'Donoghue) - on edge," noted the site.

As the ice-powered Queen struts through the town, it's clear she isn't going to be given a "warm" welcome. Dressed in her pale blue gown as she sports a side swept blonde braid, we see Regina or the Evil Queen saying, "Here we go again," as Elsa walks past, to which, Emma Swan (Jennifer Morrison) says, "Really?" in disbelief.

"Frozen" fans will see their beloved characters on the TV screen that include not only Queen Elsa but lovable Princess Anna, her beau, ice man Kristoff, villainous Prince Hans and the adorable Troll King, Pabbie.

During the San Diego Comic-Con 2014, details on the plot of the story crossover were teased. At the panel that included executive producers, Edward Kitsis and Adam Horowitz, along with series cast members, a clip was shown of sisters Elsa and Anna talking while "putting flowers on their parents' gravestones," recalled Metro UK.

Elsa tells her sister, "Anna, they would be proud of you." The site also noted that a surprise from Elsa awaits Anna as she's set to marry Kristoff.

THR, in an earlier report, quoted Kitsis and Horowitz explaing their decision to incorporate "Frozen" in the TV series: "We are dealing with the world of Frozen. We are honored to be allowed to do it. We loved the movie. We fell in love with it when it came out last year like everyone did, and we want to do our best to do it justice."

They also clarified that Disney wasn't the mastermind in this project. Describing Elsa as "misunderstood," the team of producers revealed that it's what they wanted to focus on.

"It's actually quite hard to get these characters on the show. It's not like you get a call from Mickey Mouse saying, 'I want you to sell mermaids this week.' It's the opposite. It's very hard to get these. We were very honored that Disney allowed us to take this toy off the shelf and let us play with it," the explained.

Catch the premiere of "Once Upon a Time" when it returns to ABC on Sunday, Sept. 28 at 8/9c.

See the first promo of "Once Upon A Time" as it's invaded by "Frozen," along with the season 4 promo below: