Willy Fog is again challenged by Sullivan and embarks, with his friends, in search of a secret path to the center of the Earth and the depths of the sea.
| Writing | Jules Verne | Novel |
| Sound | Guido De Angelis | Original Music Composer |
| Sound | Maurizio De Angelis | Original Music Composer |
| Writing | Rafael Soler | Adaptation |
| Crew | Claudio Biern Lliviria | Post Production Supervisor |
| Production | Cristina Nicolau | Production Coordinator |
| Production | Ray Hampson | Production Coordinator |
| Production | Olivia Borricón | Production Director |
| Production | José Luis Rodríguez | Associate Producer |
| Production | José Manuel Iglesias | Associate Producer |
| Production | Manolo Castilla | Production Manager |
| Editing | Iván Rodríguez | Editor |
| Editing | Lola Serrano | Editor |
| Art | Toni García | Storyboard Artist |
| Art | Francisco Díaz Rojo | Storyboard Artist |
| Art | Jordi Guasch | Storyboard Artist |
| Art | Fernando Herraiz | Storyboard Artist |
| Sound | Tony Atkins | Sound Mixer |
| Sound | David Richmond | Sound Effects |
| Directing | Wang Yaquan | Director |
