VIDEO: Sneak Peek - 'The Tower' Episode of ONCE UPON A TIME

On the next episode of ABC's ONCE UPON A TIME titled "The Tower", enter a tangled web of mystery as Rumpelstiltskin returns. And Rapunzel, Rapunzel, lets down her hair. Everyone in Storybrooke beware! The episode airs Sunday, March 23 at 8/7c on ABC. Get a sneak peek below!

Master storytellers Edward Kitsis and Adam Horowitz ("Lost," "Tron: Legacy") invite everyone to join Emma Swan as she struggles to understand whether she belongs in New York City, where she has begun a new life with Henry, or back in Storybrooke, where things have never been simple. As she works to provide a stable environment for her and Henry, she learns that there's no place like home. But the question remains: where is that for Emma?

Welcome to Storybrooke, Maine, a small town that probably won't show up on your GPS, but it's a magical place to visit. Reality and myth merged after Emma broke Regina's curse, which had deprived the fairytale characters of their memories and trapped them in our modern world. When they finally regained their identities, our heroes were dismayed to discover that they weren't transported back to Fairy Tale Land. To make matters worse, Rumplestiltskin - aka Mr. Gold - decided to escalate his power struggle with Regina by introducing magic into the town. But this is our world, and magic always has a tendency to yield unfathomable consequences.

The first order of business this season was to save Henry, who had been kidnapped and transported through a portal to Neverland. But Neverland was a much darker place than one remembers, and our heroes had to face a foe more powerful than the Dark One himself - Peter Pan. After being tricked and led astray for days - and learning that he was also Rumplestiltskin's father - Pan was defeated and trapped inside Pandora's Box. Our heroes returned to Storybrooke, only to discover that Pan had switched bodies with Henry and was about to enact a curse that would have killed every living soul in town. But after discovering the switch and restoring Henry back into his body, Rumplestiltskin paid the ultimate price by sacrificing his life and killing Pan. In turn, Regina obliterated her original curse, which erased Storybrooke from existence and whisked its residents back to Fairy Tale Land, leaving Emma and Henry together back in our world with pleasant memories - but with no memories of Storybrooke or its residents, and with Storybrooke itself seemingly gone for good.

And they all lived happily ever after... Hardly!