Years after the Final Battle of Storybrooke, Lucy is born to Henry and Ella Mills, although they all end up separated by a curse that sends Lucy and Cinderella to Hyperion Heights. Upon reading Henry's book, however, Lucy learns the truth and decides to find her father.
Lucy finds Henry's apartment. Although Henry denies having a daughter, Lucy implores him to come with her and save their family.
Henry, also cursed, does not believe Lucy's claims that they are fairytale characters. In response, Lucy steals Henry's laptop to lure him to Hyperion Heights. Upon learning that Lucy has run away from home to find Henry, Lucy's step-grandmother Victoria Belfrey confronts Jacinda, intending to take permanent sole custody of Lucy. When Victoria wants the community gardens dug up, Lucy believes she is trying to find something and ventures beneath the gardens, finding a piece of glass she believes is from Cinderella's glass slipper. On Halloween, Lucy goes trick-or-treating with her reluctant step-aunt Ivy, and runs away while Ivy is distracted. With Henry's help, however, Ivy finds Lucy and they go to Mr. Cluck's Chicken Shack so Jacinda can spend the rest of the night with Lucy. When Jacinda and Sabine start a beignet business, Lucy suggests stamping a firefly logo on the bags. After Victoria is arrested, Lucy is placed into the system until Jacinda gets her out with the help of Lucy's supposed father, Nick Branson. In order to revive Anastasia, Victoria crushes Lucy's belief by showing her footage of Jacinda and Nick kissing. Lucy's tears are used to bring back Anastasia, while Lucy collapses, unconscious. Lucy is rushed to hospital.
- Lucy is the daughter of Cinderella from the fairytale Cinderella.
- S6, E21: "The Final Battle, Part One"
- S6, E22: "The Final Battle, Part Two"
- S7, E01: "Hyperion Heights"
- S7, E02: "A Pirate's Life"
- S7, E03: "The Garden of Forking Paths"
- S7, E04: "Beauty"
- S7, E05: "Greenbacks"
- S7, E06: "Wake Up Call"
- S7, E07: "Eloise Gardener"
- S7, E08: "Pretty in Blue"
- S7, E09: "One Little Tear"
- S7, E10: "The Eighth Witch"