Once Upon a Time's 5 Biggest Fairy-Tale Twists

This week, we find out why Ursula (Merrin Dungey) hates Hook so much — he had taken her voice years earlier. But that's not the crazy revelation; we find out that young Ursula's teenage life mirrors the classic Little Mermaid tale — or Disney's animated version at least. She feuds with her father and sings to the sailors, and she even sings a song from the 1989 film (it's "Fathoms Below," which the sailors sing on the ship). And naturally, she's a mermaid before she transforms into the Sea Witch out of anger. One of the most interesting things about the story is that Once already has an Ariel (Jo Anna Garcia Swisher), who makes an appearance this week too.

The character of Peter Pan (Robbie Kay) is manipulated into a lot of different forms on the series — first of all, he's Gold's real father, but the biggest deviation from the traditional story of the character is that he's evil. Just straight-up evil. And in this case, Captain Hook is the good one (for now, anyway).

Ruby (Meghan Ory) is the show's Little Red Riding Hood, and when we see her origin story in season one, it's got its own special twist. She's the Wolf! Surprise.