"The Jolly Roger" is the seventeenth episode of the third season of Once Upon a Time, and the show's 61st episode overall, which aired on April 13, 2014.
Synopsis
Ariel returns to Storybrooke and pleads with Hook to help her find Prince Eric, who never returned to the town when the new curse was invoked. Emma agrees to let Regina teach her how to use magic so that she can help defeat Zelena, and Mary Margaret and David try to prove that they can be just as much fun as Hook is with Henry. Meanwhile, in fairy tale land during the past year, an angry Ariel confronts Hook over her missing Prince Eric, who she assumes was kidnapped and possibly killed by the swarthy pirate. Hook, with Ariel in tow, goes off in search of his ship.