A new trailer for the fourth season of ABC's Once Upon a Time has been released, featuring scenes from the premiere episode that include Frozen's Elsa (Georgina Haig) in the action.

Once Upon a Time Elsa Has Another 'Surprise' For Anna In Season 4

The promo spends the first half of its run-time recapping the various characters who have appeared on Once Upon a Time, including Snow/Mary Margaret (Ginnifer Goodwin), Charming/David (Josh Dallas), Evil Queen/Regina (Lana Parrilla) and more.

In the second half of the promo, however, there are many new scenes from Season 4. One particularly interesting scene shows Elsa confidently telling someone "I'm the queen."

Once Upon a Time Belle's Mother To Be Introduced In Season 4

Immediately following Elsa's proclamation is a bitter Regina saying that "she needs to be removed," suggesting that there may be some sort of rivalry between the two queens. It then cuts to a shot of the Magic Mirror (Giancarlo Esposito), a character who has not appeared on the show in a while.

The trailer also includes a scene of newlyweds Belle (Emilie de Ravin) and Rumple (Robert Carlyle) dancing in clothing that is very similar to what Belle and the Beast wore in the animated classic Beauty and the Beast.

Finally, the trailer concludes with Emma (Jennifer Morrison) and Hook (Colin O'Donoghue) exchanging quippy dialogue:

"This isn't over," Emma says, to which Hook replies, "It never is."

The upcoming season will feature the introduction of the world of Frozen into Once Upon a Time. The 2013 smash hit earned over $1 billion worldwide, making it the highest grossing animated film of all time.

Once Upon a Time begins its fourth season Sunday, Sept. 28 at 8 p.m. ET/PT on ABC.

Tags: Once Upon A Time television ABC