<Tr> <Td_colspan="2"> List of Once Upon a Time episodes </Td> </Tr> <P> The third season of the American ABC fantasy - drama Once Upon a Time was announced on May 10, 2013 . Executive producers Adam Horowitz and Edward Kitsis also noted that the season would be split into two volumes, with the first premiering on September 29, 2013 through December 15, 2013, and the second from March 9, 2014 through May 11, 2014 . </P> <P> The first volume's plot revolved around the main characters traveling to Neverland from Storybrooke to retrieve a kidnapped Henry Mills from the possession of Peter Pan . After successfully retrieving Henry, the characters returned to Storybrooke, only to be returned to their original worlds following Pan's new Curse, leaving Emma Swan and Henry to escape to New York City . The second plot followed the characters' past journey in the Enchanted Forest and how they were brought back to Storybrooke by the Wicked Witch of the West, while also documenting Emma's mission to break the new Curse and save her family . New characters introduced in the season include the main antagonists of the two volumes: Peter Pan and the Wicked Witch of the West, in addition to Tinker Bell, Ariel, Prince Eric, Ursula, Medusa, Rapunzel, Lumiere, the Wizard of Oz, Glinda the Good Witch, the Good Witch of the North, the Witch of the East, Dorothy Gale, Blackbeard, and Elsa . </P> <P> The season premiere was watched by 8.52 million viewers, achieving an adult 18 - 49 rating / share of 2.6 / 7 . The mid-season finale received critical acclaim from critics with many praising the episode's ending, Mr. Gold's fate, and the flash - forward technique used . The spring premiere brought in the highest viewing figures since the season's second episode, earning the highest weekly viewership rank for the series since the second episode of the second season in October 2012 . The episode was met with positive reviews, with critics complimenting the unpredictable nature of the new story lines created by the writers and producers . The 2 - hour season finale was watched by 6.8 million viewers, with an adult rating / share of 2.3 / 7, becoming the least - viewed season finale yet, despite the improved ratings . On May 8, 2014, the series was renewed for a fourth season, which premiered in September 28, 2014 . </P>

When is peter pan introduced in once upon a time
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