Nemo is the captain of the submarine known as the Nautilus. After his family was brutally murdered, Nemo wreaked revenge on those responsible. Some time later, a man named Liam joined his crew. After posing as a stowaway on Captain Hook's ship, Nemo kidnaps Hook and takes him to the Nautilus where he finds out Liam is Hook's half-brother who was orphaned after Hook killed their father. Nemo prevents Liam from killing Hook, resulting in Liam stabbing Nemo.
Although Nemo's condition is preserved in the Land of Untold Stories, he is rushed to hospital due to his stab wound when he and his crew arrive in Storybrooke due to Hyde. There, Nemo reunites with Liam, who stops seeking revenge on Hook and is willing to settle down with the family he already has aboard the Nautilus. However, Hook finds himself trapped with Nemo and his crew on the Nautilus when Gideon banishes them to the Enchanted Forest, where the Nautilus is attacked by a kraken. While Nemo and his crew seek to repair their vessel, Hook leaves with Aladdin and Jasmine.
- None known (family)
- He is based on Captain Nemo from the stories Twenty Thousand Leagues Under The Sea and The Mysterious Island.
- S5, E22: "Only You" (storybook)
- S6, E06: "Dark Waters"
- S6, E14: "Page Twenty-Three"
- S6, E15: "A Wondrous Place"