The story of the last Seal Child’s journey home. After their mother’s disappearance, Ben and Saoirse are sent to live with Granny in the city. When they resolve to return to their home by the sea, their journey becomes a race against time as they are drawn into a world Ben knows only from his mother’s folktales. But this is no bedtime story; these fairy folk have been in our world far too long. It soon becomes clear to Ben that Saoirse is the key to their survival.
| Directing | Tomm Moore | Director |
| Writing | Will Collins | Writer |
| Sound | Bruno Coulais | Original Music Composer |
| Writing | Tomm Moore | Story |
| Production | Katja Schumann | Production Manager |
| Editing | Darragh Byrne | Editor |
| Production | Claus Toksvig Kjaer | Production Manager |
| Production | Tomm Moore | Producer |
| Visual Effects | Pascal Nowak | Color Designer |
| Sound | Garret Farrell | Recording Supervision |
| Directing | Nora Twomey | Other |
| Production | Joshua Jason | Publicist |
| Visual Effects | Eric Dupont | Visual Effects Supervisor |
| Crew | Marc Umé | Software Engineer |
| Production | Clément Calvet | Co-Producer |
| Editing | Darren T. Holmes | Editorial Coordinator |
| Visual Effects | Marc Umé | Visual Effects Supervisor |
| Visual Effects | Slaven Reese | Animation |
| Production | Paul Young | Producer |
| Art | Ross Stewart | Art Department Coordinator |
| Crew | Kila | Additional Music |
| Visual Effects | Marion Roussel | Animation |
| Visual Effects | Alessandra Sorrentino | Animation |
| Production | Stéphan Roelants | Co-Producer |
| Visual Effects | Frederik Villumsen | Animation Director |
| Art | Sidonie Vidal | Background Designer |
| Visual Effects | Virgile Bage | Animation |
| Visual Effects | Sandra Norup Andersen | Character Designer |
| Visual Effects | François Crèvecoeur | VFX Artist |
| Visual Effects | Jeremy Purcell | Visual Effects Supervisor |
| Art | Adi Merigeau | Production Design |
| Art | Alessandra Sorrentino | Storyboard Designer |
| Visual Effects | Santiago López Jover | Animation |
| Sound | Alexandre Jaclain | Sound Designer |
| Production | Atshong Chen | Production Accountant |
| Visual Effects | Alfredo Cassano | Animation |
| Visual Effects | Geoff King | Animation |
| Visual Effects | Ole Christian Løken | Animation |
| Visual Effects | Stine Sæthre | Animation |
| Crew | Michel Hick | Software Engineer |
| Directing | Fabian Erlinghäuser | First Assistant Director |
| Production | Jérémie Fajner | Co-Producer |
| Production | Serge Umé | Co-Producer |
| Sound | Nostradine Benguezzou | Sound Re-Recording Mixer |
| Visual Effects | Marie Thorhauge | Character Designer |
| Production | Frederik Villumsen | Producer |
| Sound | Marie Doyeux | Sound Re-Recording Mixer |
| Visual Effects | Louise Bergholt Sørensen | Animation |
| Production | Samuel Feller | Associate Producer |
| Art | Adi Merigeau | Art Direction |
| Crew | Susana Grilo | Production Intern |
| Production | Ross Murray | Producer |
| Visual Effects | Svend Andreas Rothmann Bonde | Animation |
| Visual Effects | Giovanna Ferrari | Animation |
| Visual Effects | Denis Figueiredo | Animation |
| Visual Effects | Tomislav Findrik | Animation |
| Visual Effects | Mathilde Vachet | Animation |
| Production | Thibaut Ruby | Line Producer |
| Visual Effects | Danas Berznitsky | Animation |
| Visual Effects | Fabian Erlinghäuser | Animation Director |
| Production | Isabelle Truc | Co-Producer |
| Visual Effects | Walter Giampaglia | Animation |
| Visual Effects | Rosa Ballester Cabo | Character Designer |
| Crew | Tod Polson | Thanks |
| Sound | Patrice Renson | Conductor |
| Directing | Stuart Shankly | First Assistant Director |
| Sound | Félix Davin | Sound Designer |
