Ten-year-old Nico receives a threatening letter and now his life is in danger. No one seems to believe him except one person that he doesn't know.
Is The Warning on Netflix? Yes! The movie The Warning is now on Netflix in the countries listed below.
| Directing | Daniel Calparsoro | Director |
| Writing | Jorge Guerricaechevarría | Writer |
| Writing | Chris Sparling | Writer |
| Sound | Julio de la Rosa | Music |
| Camera | Sergi Vilanova | Director of Photography |
| Editing | Antonio Frutos | Editor |
| Writing | Paul Pen | Novel |
| Sound | Sergio Burmann | Sound Mixer |
| Production | Pedro Uriol | Producer |
| Writing | Patxi Amezcua | Adaptation |
| Production | Pilar Benito | Executive Producer |
| Production | Cristina Zumárraga | Co-Producer |
| Art | Pilar Revuelta | Production Design |
| Production | Josep Amorós | Production Manager |
| Sound | James Muñoz | Sound |
| Sound | José A. Manovel | Sound |
| Crew | Elena Alcolea | Post Production Supervisor |
| Costume & Make-Up | Cristina Rodríguez Torres | Costume Design |
| Costume & Make-Up | Almudena Fonseca | Makeup Department Head |
| Costume & Make-Up | Pablo Morillas | Hair Department Head |
| Directing | Sara Mazkiarán | First Assistant Director |
| Production | Rosa Estévez | Casting Director |
| Directing | Óscar Marcos Bello | Second Assistant Director |
| Directing | Nerea Castro | Second Assistant Director |
| Directing | Juan Vicente Riuve | Script Supervisor |
| Art | Pablo Buratti | Storyboard Artist |
| Directing | Ander Fernández | Third Assistant Director |
| Directing | Ángel Vico | Assistant Director Trainee |
| Production | Álex Miyata | Unit Production Manager |
| Camera | Juanjo Sánchez | Camera Operator |
| Camera | Juanjo Sánchez | Steadicam Operator |
| Camera | Ramiro Sabell hijo | First Assistant "A" Camera |
| Camera | Aarón López Santamaría | First Assistant "B" Camera |
| Camera | Susana Siscart | Second Assistant "A" Camera |
| Camera | Jara Bustos | Second Assistant "B" Camera |
| Camera | Ernesto Reguera | Digital Imaging Technician |
| Camera | Shantall González | Camera Trainee |
| Crew | Ibon Antuñano | Second Unit Cinematographer |
| Crew | Jon Corcuera | Second Unit Cinematographer |
| Camera | Aitor Higuera | Assistant Camera |
| Camera | José Burgos Sologuren | Assistant Camera |
| Camera | Lucía Faraig | Still Photographer |
| Camera | Marta Longás | BTS Videographer |
| Camera | Felix Bollain | BTS Videographer |
| Art | Carmen Agulló | Property Master |
| Art | Montse Aguado | Assistant Property Master |
| Art | Rodrigo Busto | On Set Props |
| Art | José Luis Saldaña | Set Dresser |
| Art | Marta Bataller | Set Dresser |
| Art | Arturo Revuelta | Set Dresser |
| Art | Ferrán Navarro-Beltrán | Assistant Set Decoration |
| Costume & Make-Up | María Ángeles Gil Vila | Seamstress |
| Costume & Make-Up | Unai Cáceres Mateos | Assistant Costume Designer |
| Costume & Make-Up | Yael Fernández-Maquieira | Makeup & Hair Assistant |
| Sound | Luis Sánchez Giner | Boom Operator |
| Sound | Tamara Arévalo | Boom Operator |
| Sound | Lucas Fernández | Sound Assistant |
| Lighting | Miguel Ángel Cárdenas | Gaffer |
| Lighting | Raúl Pérez | Electrician |
| Lighting | Kiko Boyero | Electrician |
| Lighting | Eduardo Hernandez | Electrician |
| Lighting | Javier Casado | Electrician |
| Camera | Iván Sequeira | Key Grip |
| Camera | Jesús Santa | Grip |
| Camera | José Santa | Grip |
| Editing | Javi Frutos | First Assistant Editor |
| Crew | Cuco Usín | Stunt Coordinator |
| Crew | Alex López Estacio | Stunt Coordinator |
| Crew | Alejandro Pantany | Stunts |
| Crew | Katia Fernández | Stunts |
| Crew | José Antonio Oña Sánchez | Stunts |
| Crew | Alejandro Gómez de la Torre | Stunts |
| Crew | Ricardo Rocca | Stunts |
| Crew | Fernando Martín Maestro | Stunts |
| Crew | Jon Bermúdez | Stunts |
| Crew | Carlos Nieto-Balboa | Stunts |
| Crew | Nacho Herraez | Stunts |
| Crew | Eduardo Gago Muñoz | Stunts |
| Crew | Jaime Herrera | Stunts |
| Crew | Aitana Domínguez | Stunts |
| Crew | Miguel Arregui | Stunts |
| Crew | Cuco Usín | Stunts |
| Crew | Alex López Estacio | Stunts |
| Visual Effects | David Campos | Special Effects Supervisor |
| Visual Effects | Antonio J. Jiménez | Visual Effects Supervisor |
| Editing | Noémie Dulau | Digital Colorist |
| Sound | Jaime F. Salcedo | Dialogue Editor |
| Sound | Alberto Abengozar | ADR Recordist |
| Sound | César de Mosteyrín | Songs |
| Sound | Alberto Jiménez | Songs |
