But before we head to the Underworld, head back in time to relive 100 episodes of heroes, villains, and adventures in this loving retrospective:
Ah, memories. TVLine just shared some great spoilers on what's ahead in the winter premiere. Here are just three tantalizing teases:
• The premiere kicks off with one of the series' most powerful and emotional cold opens ever, doing justice to storylines past and present.
• "Chip" puts in an appearance, sparking a flashback to a "lost" scene between Rumple and Belle.
• By the end of the hour, one character will experience an extreme reversal of fortune.
"Once Upon a Time" returns Sunday, March 6 at 8 p.m. ET on ABC.
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