Once Upon a Time: Underworld teased by Ginnifer Goodwin, Lana Parrilla

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Once Upon a Time’s version of the Underworld is, in a word, twisted.

After Emma (Jennifer Morrison) discovered that Hook’s (Colin O’Donoghue) sacrifice to save the residents of Storybrooke from certain death was all in vain — never trust the Dark One (Robert Carlyle)! — she led a ragtag group into the Underworld to save him. But where they’re headed is quite familiar. A promo for the second half of the season has revealed that the Underworld is basically Storybrooke, only with a twist.

“Hell, as a geographical location, is not what we expect it to be,” Ginnifer Goodwin tells EW. “What we do find ends up being pretty profound and enables us to relive some of the original Once Upon a Time season 1 themes.”

While it feels similar to home for Emma (Jennifer Morrison) and the gang, all is not what it appears. “It’s almost identical to Storybrooke,” Lana Parrilla says. “It reminds me of when Marty McFly goes back to his old neighborhood, it’s just different and torn down, there’s graffiti everywhere. Storybrooke doesn’t look the same at all.” Hence the smoke stacks everywhere and the downed clock tower in the middle of the road. As for why Hell appears this way, there is a very interesting explanation that will be revealed when the show returns.

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As the promo also teased, Underworld houses a number of familiar faces, including Cora (Barbara Hershey), Henry (Tony Perez,) Peter Pan (Robbie Kay), Cruella de Vil (Victoria Smurfit) and Milah (Rachel Shelley), who are all slated to return in the back half of the season. “Everyone has unfinished business,” Parrilla says. “That’s why all these souls are down there. For a lot of them, we’re that business. And I would say, Regina’s probably most of that, as is Gold. We’re going to be confronted with a lot of angry souls.”

Once Upon a Time returns Sunday, March 6 at 8 p.m. ET on ABC. Stay tuned for much more scoop on what’s in store for the gang in the Underworld!