"The Stable Boy" is the 18th episode of the American fairy tale/drama television series Once Upon a Time, which aired in the United States on ABC on April 1, 2012. The series takes place in the fictional seaside town of Storybrooke, Maine, in which the residents are actually characters from various fairy tales that were transported to the "real world" town by a powerful curse. In this episode, Emma looks for evidence to prove that Regina framed Mary Margaret. In flashbacks, Regina must make a decision for her future: either marry Snow's father or be with her crush.