The Once Upon a Time season 4 premiere will be preceded by a Frozen-themed special, to catch viewers up on season 3 storylines.

Excited for Once Upon a Time season 4 to premiere later this month? So are we! And don’t worry about trying to keep track of all the things that happened in the season 3 finale, because ABC’s got you covered.

Once Upon a Time: Storybrooke has Frozen Over will air Sunday, September 28 at 7/8c. It’ll last an hour, including commercial breaks, and will be directly followed by the season 4 premiere episode, “A Tale of Two Sisters.”

The special will recap everything that happened in season 3, from the Neverland arc in which our heroes confronted Peter Pan (Robbie Kay) to the fallout of the Wicked Witch (Rebecca Mader)’s short reign of terror in Storybrooke.

Executive producers Adam Horowitz and Ed Kitsis will add commentary to the special, offering inside knowledge about the season that passed.

They will also give a few hints about what we can expect from Once Upon a Time season 4, including small scoops about the highly publicised Frozen arc which will feature heavily in the first batch of episodes.

Related: Once Upon a Time gets a chilly season 4 poster

As we saw in the season 3 finale, Elsa (Georgina Haig) has arrived in Storybrooke, scared and confused. The season 4 premiere synopsis reveals that she’ll summon up an ice monster for protection, and the promotional images indicate that (whether it’s justified or not) she’ll be viewed as a threat to the community.

We can’t wait to learn more about Elsa’s past and how she ended up trapped in Rumpelstiltskin’s dungeon. Which storyline are you most excited to see explored in season 4?

Once Upon a Time season 4, episode 1 “A Tale of Two Sisters,” will air Sunday, September 28 at 8/7c. Tune in an hour earlier for the Storybrooke Has Frozen Over special!