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To quote Prince Charming (Josh Dallas), "It's not every day your wife tells you she was friends with a god." Hey, Hercules is a demigod. Get it right. In the above exclusive Once Upon a Time sneak peek, Snow (Ginnifer Goodwin) discovers her former friend is dead and in the Underworld.

"If he's down here, he has unfinished business. We have to find a way to help him move on," she says. But aren't they there for Hook (Colin O'Donoghue)? Sure, but Snow has a plan, naturally. Click play on the video up top to learn more.

This isn't the first time Once Upon a Time has changed fairy tale lore. Viewers will recall the show has made the Evil Queen (Lana Parrilla) the half-sister of Wizard of Oz's Wicked Witch (Rebecca Mader) and Peter Pan (Robbie Kay) the father of Rumplestiltskin (Robert Carlyle). Wrap your head around that one.

Once Upon a Time will introduce Hercules in teenage form when Jonathan Whitesell makes his first appearance. Kasey Rohl will play Meg, his love interest.

Will Herc be able to help the heroes find Hook and get out of the Underworld? Tune in on Sunday at 8 p.m. on ABC.