David - aka John Doe - must choose between staying with Kathryn or leaving her to be with Mary Margaret, with whom he's fallen deeply, and inexplicably, in love; and Emma catches Sheriff Graham in a lie. Meanwhile, back in the fairytale world that was, Prince Charming is about to encounter a life-changing event that will forever alter his destiny.

A dejected Sidney enlists the aid of Emma to help uncover evidence that could expose Mayor Regina as the corrupt person she really is to the townspeople of Storybrooke. Mary Margaret and David continue their secret rendezvous while trying to figure out a way to unleash their forbidden love. Meanwhile, back in the fairytale land that was, King Leopold, who is the father of Snow White and married to the Evil Queen, stumbles upon a magic lamp and is granted three wishes by a Genie - who warns the king to be careful what he wishes for.

Mary Margaret hires Mr. Gold as her attorney when Emma is forced to arrest her for the suspected murder of David’s wife, Kathryn. Meanwhile, back in the fairytale land that was, Prince Charming sets out to stop a determined and unhinged Snow White, whose memory is still clouded by Rumplestiltskin’s potion, from assassinating the Evil Queen.

August tells Emma how to beat Regina and how she can get custody of Henry, while Regina hatches a plot to seduce David now that Mary Margaret is back at work. In the fairy-tale world, a plan to save Snow White and Prince Charming’s daughter unfolds and is agreed to by Geppetto, who has his own child’s safety in mind.

Emma and Mary Margaret try to find a portal that would bring them back to Storybrooke; Henry tries to talk Jefferson into reuniting with his daughter; on the eve of meeting Prince Charming's mother, King George poisons Snow White.

Ruby's fear about turning into a wolf is confirmed when she becomes the prime suspect for a vicious murder; Leroy finds treasure in a Storybrooke mine that could help Emma and Mary Margaret.

Mr. Gold tries to use an unwilling test subject to see if his spell works; Belle runs into vengeful Capt. Hook; David and Mary Margaret look for a bigger house.

David, Emma and Mr. Gold try to protect Mary Margaret from a vengeful Regina; a man and his son find their way into Storybrooke.

Mary Margaret, David and Emma embark on a search when Regina and some magic beans go missing; Mr. Gold considers revealing the truth to Lacey; Bae winds up in 19th century London.