Fall TV Catch-Up Guide: 'Once Upon a Time'

ONCE UPON A TIME - Master storytellers Edward Kitsis and Adam Horowitz (Lost, Tron: Legacy) invite everyone to join Emma Swan, Snow White, Prince Charming, The Evil Queen, Hook and all the other resident fairytale characters as they prepare to defend themselves against a magical force from the past that's too unpredictable even for Rumplestiltskin - Elsa, the Ice Queen from Arendelle. (ABC/Katie Yu) SCOTT MICHAEL FOSTER, GEORGINA HAIG
ONCE UPON A TIME - Master storytellers Edward Kitsis and Adam Horowitz (Lost, Tron: Legacy) invite everyone to join Emma Swan, Snow White, Prince Charming, The Evil Queen, Hook and all the other resident fairytale characters as they prepare to defend themselves against a magical force from the past that's too unpredictable even for Rumplestiltskin - Elsa, the Ice Queen from Arendelle. (ABC/Katie Yu) SCOTT MICHAEL FOSTER, GEORGINA HAIG

When's It Back? Sunday, Sept. 28 at 8 p.m. on ABC

Where We Left Off: Emma and Hook were sucked into a time portal, which took them to Fairy Tale Land of the past. After nearly messing up her parents' falling-in-love story (and her own existence), Emma finally found a way to get back home, with an assist from Rumplestiltskin. But when she and Hook returned to Storybrooke, they brought back a new friend — who turned out to be Maid Marian, Robin's wife, thus breaking Regina's heart.

And they also unintentionally brought along someone who was locked up in Rumple's vault. Someone who left a Frozen trail in her wake.

What We Know About Season 4: Frozen comes to OUAT! Yes, the beloved characters from Disney's blockbuster animated movie — Elsa, Anna, and Kristoff — will be a major part of this season. We'll see flashbacks to Arendelle and how Elsa came to be a prisoner of Rumple.

[Photos: Check Out More 'Frozen' Pics From 'Once Upon a Time']

Meanwhile, Regina is tempted to turn evil again after losing her love... and she totally blames Emma for it. Robin may be happily reunited with his wife, but also has to deal with frenemy Will Scarlet coming to town from Wonderland. And though Rumple and Belle wed in the finale, it can't be long before she finds out he didn't give her the real Dark One's dagger.

Our Burning Question: Will Emma and Hook make it work? She kissed the roguish captain in the finale, after he'd pined for her for so long. They've both loved and lost before, and they might find it difficult to open up once again. Their chemistry may be off the charts, but can either do a relationship?

More Fall TV Catch-Up Guides:

Arrow
The Vampire Diaries
Brooklyn Nine-Nine
Scandal
Grey's Anatomy
Parenthood
The Good Wife
The Blacklist
Person of Interest
NCIS
Marvel's Agents of S.H.I.E.L.D.
Sleepy Hollow
The Big Bang Theory
The Mindy Project