It was one of the darkest episodes of the whole show and had a profound impact on later installments.

The episode itself first aired on the 28th of October 2012, just three days before Halloween.

Although it isnt set at Halloween, it feels considerably darker than other episodes of the show.

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Everything about the episode built up to the big reveal of Doctor Whales identity.

It was interesting to see the dynamic between Rumpelstiltskin and Frankenstein arguing over the use of science and magic.

Until this point,science was an alien force inOnce Upon a Time’s story.

Doctor Whale Dr Frankenstein Once Upon A Time

Instead, he was just a normal literary character.

In later seasons of the show,even Jekyll and Hyde appearedin a few episodes.

In Once Upon a Time season three, Rumpelstiltskin sacrificed himself to get rid of Peter Pan.

David Anders as Frankenstein in the land without color in Once Upon a Time

Once Upon a Time is an adventure fantasy-drama series created for ABC that features fairy tale characters and their Disney incarnations in a modern setting. When Emma Swan and her son Henry accidentally drive into the town of Storybrooke, they soon discover the inhabitants are those from fairy tales, and they have no knowledge of the modern world inhabited by Emma and Henry. Robbed of their pasts and given new identities by the Evil Queen known as Regina, the hope of the town’s residents lie solely in the hands of Emma, who has stronger connections to the town than she knows.

But when Rumpelstiltskin returned, Peter Pan didn’t.

Dr Whale played by David Anders working in the hospital in Once Upon a Time

Robbie Kay as Peter Pan in Once Upon a Time

Headshot Of Ginnifer Goodwin

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Once Upon a Time