Once Upon a Time is an American fantasy adventure drama television series that aired for seven seasons on ABC from October 23, 2011, to May 18, 2018. The action alternates between two main settings: a fantastical world where fairy tales happen, and a fictional seaside town in Maine called Storybrooke. The "real-world" part of the story unfolds with the characters of Emma Swan and her 10-year-old son, Henry Mills. Henry discovers the other people of the town are fairy-tale characters. The audience is shown the backstory of the town's people as fairy-tale characters, in conjunction with their unfolding stories in the "real-world". In the seventh and final season, the "real-world" portion of the story takes place in Seattle, Washington, in the fictitious neighborhood of "Hyperion Heights", with a new main narrative led by adult Henry, and his wife and daughter.

Emma Swan is a fictional character and the protagonist of ABC's television series Once Upon a Time. She is portrayed by Jennifer Morrison as an adult, by Abby Ross as a teenager, and by Mckenna Grace as a child. Emma appears in the series' pilot as a bail bond agent in Boston, Massachusetts, until she meets her biological son Henry, whom she gave up for adoption 10 years before. She learns she is the long lost daughter of Snow White and Prince Charming who gave her up shortly after her birth 28 years ago so she wouldn't die at the hands of Regina Mills, also known as the Evil Queen. Sadly, she doesn’t learn this vital information until the beginning of season two. Henry tells Emma of her true identity; she is the prophesied “Savior” and is destined to break the Evil Queen’s curse, saving the fictional town of Storybrooke, Maine, and restoring the residents’ happy endings.