When Belle becomes pregnant with Rumplestiltskin's baby, she learns that Rumplestiltskin owes his secondborn child to Hades. To protect her unborn child, Belle puts herself under a Sleeping Curse, preserving mother and child together. In the dream world, Belle is able to communicate with his son, although she is unaware that he is her son, as he pretends to be Morpheus, the god of dreams. As Morpheus, he warns Belle to stay away from Rumplestiltskin, before kissing her on the forehead, awakening her in real life. When Belle gives birth to her son, she names him Gideon after the hero of her favorite book. Desperate to keep her son away from Rumplestiltskin, Belle has the Blue Fairy take Gideon somewhere safe. While transporting Gideon, however, Blue is ambushed by the Black Fairy, who takes him back to her realm. He is trained in magic, and becomes the Black Fairy's "son". However, when Gideon begins to rebel against her, the Black Fairy rips out his heart - ensuring his loyalty - before instructing Gideon to find and kill the Savior, Emma.
Twenty-eight years later, Gideon leaves the Black Fairy's realm, returning to Storybrooke. After trapping the Evil Queen in the form of a caged cobra, Gideon visits his parents. As time works differently in the Black Fairy's realm, however, his parents only learn about Gideon's abduction moments before Gideon returns as an adult. Gideon claims that he has returned to kill Emma and become the new Savior to kill the Black Fairy, who took him in the first place. When Emma returns from the Wish Realm, she and Gideon face off. Despite Emma's visions, she emerges victorious and Gideon vanishes, later destroying the clock tower. With his father's help and the Blue Fairy's blood, Gideon restores Hrunting, the sword destined to kill Emma Swan. He later banishes Hook on the Nautilus, blackmailing Emma into helping him kill the Black Fairy. However, Gideon is revealed to be under the Black Fairy's control, and needs Emma vulnerable enough to use her life force to open a portal to the Black Fairy. He fails to kill her, but enough life force is used to open a portal, bringing the Black Fairy to Storybrooke.
Gideon learned dark magic from his grandmother, the Black Fairy, and possesses an array of powers.
- Transformation: Gideon can transform other people, or objects, into something different.
- Telekinesis: He can also telekinetically move people and objects.
- Teleportation: Gideon has displayed the ability to teleport from one place to another.
- Glamour: Gideon can disguise himself as other people, such as David.
- Rumplestiltskin (father)
- Belle French (mother)
- Baelfire (deceased half-brother)
- Henry Mills (nephew)
- Reul Ghorm (godmother)
- Maurice (maternal grandfather)
- Colette (deceased maternal grandmother)
- Peter Pan (deceased paternal grandfather)
- Black Fairy (paternal grandmother / adoptive mother)
- He is the son of the beauty and the beast from the fairytale Beauty and the Beast.
- When disguised, he claimed to be the god of dreams from Greek Mythology.
- Gideon is named after a hero in Belle's favorite childhood book, Her Handsome Hero.
- Gideon is the hooded figure in Emma Swan's visions, supposedly destined to kill her.
- S6, E01: "The Savior" (vision)
- S6, E02: "A Bitter Draught" (vision)
- S6, E05: "Street Rats" (vision)
- S6, E09: "Changelings"
- S6, E10: "Wish You Were Here"
- S6, E11: "Tougher Than The Rest"
- S6, E13: "Ill-Boding Patterns"
- S6, E14: "Page Twenty-Three"
- S6, E15: "A Wondrous Place"
- S6, E16: "Mother's Little Helper"
- S6, E17: "Awake"