A Tale of Two Sisters (Once Upon a Time)

"A Tale of Two Sisters" is the twelfth episode of the fourth season of the American fantasy drama television series Once Upon a Time, which aired on November 30, 2014.

The episode primarily focuses on the backstories of Elsa and Anna, the sisters from Disney's Frozen, detailing their relationship both before and after the events of the film. Flashbacks reveal Anna and Elsa searching for a way to control Elsa's powers and uncover the truth about their parents' fateful voyage, leading them to the enchanted forest and encountering Rumplestiltskin.

In Storybrooke, Elsa continues her search for Anna, believing her sister is in danger. Emma Swan and David Nolan (Prince Charming) assist in the search. Meanwhile, Regina Mills grapples with the return of Marian and the complex emotions surrounding Robin Hood's affections. The episode also features Ingrid, the Snow Queen, whose motives and connection to Emma and Elsa are further explored. The episode culminates in revelations about Ingrid's past and her connection to Elsa and Emma, setting the stage for the season's overarching narrative.