Six years after the events of The X-Files series finale, former FBI agent Doctor Dana Scully is now a staff physician at Our Lady of Sorrows, a Catholic hospital, and treating a boy named Christian who has Sandhoff disease, a terminal brain condition. FBI agent Drummy arrives to ask Scully’s help in locating Fox Mulder, the fugitive former head of the X-Files division, and says they will call off its manhunt for him if he will help investigate the disappearances of several women, including young FBI agent Monica Banan. Mulder and Scully are called back to duty by the FBI when a former priest claims to be receiving psychic visions pertaining to a kidnapped agent.
Unfortunately the movie The X Files: I Want to Believe is not yet available on HBO Max.
| Writing | Chris Carter | Screenplay |
| Crew | Paul Rabwin | Post Production Supervisor |
| Art | Sabine Schoppel | Art Department Coordinator |
| Sound | David Giammarco | Sound Re-Recording Mixer |
| Costume & Make-Up | Raul Casillas | Set Dressing Artist |
| Art | Mike Rennison | Construction Coordinator |
| Camera | Bill Roe | Director of Photography |
| Editing | Richard A. Harris | Editor |
| Crew | Julio Pallares | Makeup Effects |
| Costume & Make-Up | Geoff Coulter | Set Dressing Artist |
| Production | Chris Carter | Producer |
| Art | Paul Rinaldi | Construction Foreman |
| Costume & Make-Up | Scott Holburn | Set Dressing Artist |
| Sound | David Betancourt | Foley |
| Sound | David Grimaldi | Sound Effects Editor |
| Costume & Make-Up | Sandy Monesmith | Hairstylist |
| Costume & Make-Up | Jared Brown | Set Dressing Artist |
| Costume & Make-Up | Leonardo Lara | Set Dressing Artist |
| Directing | Chris Carter | Director |
| Costume & Make-Up | Victoria Down | Makeup Department Head |
| Crew | Bill Terezakis | Makeup Effects |
| Costume & Make-Up | Mark Prior | Set Dressing Artist |
| Production | Simon Abbott | Production Manager |
| Crew | E.J. Foerster | Second Unit |
| Crew | Maureen Terezakis | Makeup Effects |
| Writing | Frank Spotnitz | Screenplay |
| Art | Mark S. Freeborn | Production Design |
| Production | Wayne Bennett | Production Manager |
| Production | Brent O'Connor | Unit Production Manager |
| Writing | Jenny Seinen | Storyboard |
| Art | Tony Wohlgemuth | Art Direction |
| Crew | David McKimmie | Post-Production Manager |
| Art | David Hadaway | Set Designer |
| Art | Cheryl Marion | Assistant Art Director |
| Costume & Make-Up | Lisa Tomczeszyn | Costume Design |
| Production | Mindy Marin | Casting |
| Art | Shirley Inget | Set Decoration |
| Crew | Christopher Mark Pinhey | Makeup Effects |
| Production | Coreen Mayrs | Casting |
| Sound | Mark Snow | Original Music Composer |
| Production | Heike Brandstatter | Casting |
| Crew | Richard Martin | Compositors |
| Sound | Alicia Stevenson | Foley |
| Crew | Charles Collyer | Compositors |
| Crew | Mike Spring | Compositors |
| Sound | Chuck Michael | Sound Designer |
| Sound | Charleen Richards-Steeves | ADR & Dubbing |
| Crew | Jason Dunn | Compositors |
| Visual Effects | Andrew Lema | CG Painter |
| Crew | Pierre Raymond | Executive Visual Effects Producer |
| Crew | Mark Goldberg | Compositors |
| Visual Effects | Tena Montoya | Visual Effects Producer |
| Visual Effects | Eugene Paluso | CG Painter |
| Crew | Ryan Epp | Compositors |
| Crew | Matthias Lowry | Compositors |
| Crew | Brian Petras | Compositors |
| Production | Dan Rucinski | Production Supervisor |
| Visual Effects | Andrea Shear | CG Painter |
| Visual Effects | Randal Shore | Visual Effects Producer |
| Visual Effects | Thomas F. Ford IV | Visual Effects Producer |
| Crew | Christina Spring | Compositors |
| Visual Effects | Junji Hirano | CG Painter |
| Visual Effects | Brenda Ilic | Visual Effects Producer |
| Visual Effects | Joni Jacobson | Visual Effects Producer |
| Sound | Paul Massey | Sound Re-Recording Mixer |
| Crew | David Gauthier | Special Effects Coordinator |
| Crew | Rodrigo Armendariz | Compositors |
| Crew | Steve J. McLeod | Compositors |
| Crew | Vinay Mehta | Compositors |
| Crew | Marty Taylor | Compositors |
| Crew | Bill Edwards | Stunts |
| Crew | Dean Hart | Stunts |
| Sound | Randall Guth | First Assistant Sound Editor |
| Sound | Warren Hendriks | Sound Effects Editor |
| Sound | Martin Lacroix | Boom Operator |
| Visual Effects | Steve Au | CG Painter |
| Visual Effects | Mat Beck | Visual Effects Supervisor |
| Visual Effects | Anouk Deveault-Moreau | Visual Effects Supervisor |
| Crew | Linda Drake | Visual Effects Editor |
| Visual Effects | Graham Houston | CG Painter |
| Visual Effects | Rod Park | Visual Effects Producer |
| Crew | Andrew Edwards | Compositors |
| Visual Effects | Jack Noriaki Matsumoto | CG Painter |
| Crew | Brian Sales | Compositors |
| Sound | Erin Michael Rettig | Sound Engineer |
| Crew | Don Greenberg | Compositors |
| Crew | Wayne A. Shepherd | Compositors |
| Crew | Patrick Thompson | Compositors |
| Sound | David Lucarelli | ADR & Dubbing |
| Crew | David Alexander | CG Supervisor |
| Visual Effects | Glenn Curry | CG Painter |
| Production | Anne Tremblay | Administration |
| Crew | William Unrau | Cableman |
| Crew | Michel Barrière | Compositors |
| Visual Effects | Daniel Leduc | Visual Effects Producer |
| Visual Effects | Trent Smith | Visual Effects Producer |
| Crew | Jennifer Mylrea | Stunts |
| Crew | Chris Atkinson | Stunts |
| Camera | Mitch Bax | Camera Intern |
| Visual Effects | John C. Wash | Visual Effects Supervisor |
| Crew | Guy Bews | Stunts |
| Lighting | Ryan Bailey | Gaffer |
| Production | Frank Spotnitz | Producer |
| Crew | Corbin Fox | Stunts |
| Crew | Tony Morelli | Stunts Coordinator |
| Crew | Jeff Sanca | Stunts |
| Crew | Natasha Vasiluk | Stunts |
| Crew | Donald Tse | Compositors |
| Visual Effects | Dmitry Vinnik | CG Painter |
| Crew | James Bamford | Stunts |
| Crew | Melissa R. Stubbs | Stunts |
| Crew | Dave Williams | Compositors |
| Visual Effects | Ian Wilson | CG Painter |
| Crew | Dave Lane | Stunts |
| Crew | Duane Dickinson | Stunts |
| Crew | Mike Dobbin | Stunts |
| Crew | Mike Mitchell | Stunt Coordinator |
| Crew | Kimberly Chiang | Stunts |
| Crew | Todd Scott | Stunts |
| Costume & Make-Up | Gitte Axen | Makeup Artist |
| Production | Brent O'Connor | Executive Producer |
| Crew | Marshall Virtue | Stunts |
| Crew | Chris Webb | Stunts |
| Crew | George Collins | Video Assist Operator |
| Camera | Matt Almas | Grip |
| Camera | John S. Bartley | Second Unit Director of Photography |
| Sound | Michael T. Williamson | Sound Mixer |
| Sound | Tim Gomillion | Sound Recordist |
| Visual Effects | Shane Strickman | Visual Effects Coordinator |
| Art | Marta McLaughlin | Assistant Property Master |
| Sound | Gloria D'Alessandro | Dialogue Editor |
| Sound | Mildred Iatrou | ADR Editor |
| Sound | Matthew Harrison | Foley Editor |
| Art | Brad McMurray | Set Decorating Coordinator |
| Visual Effects | Bryce Brecheisen | Visual Effects Coordinator |
| Art | Eric Partridge | Assistant Property Master |
| Camera | Cory Budney | First Assistant Camera |
| Directing | Portia Tickell | Script Supervisor |
| Sound | Scott Curtis | Foley Editor |
| Sound | Galen Goodpaster | Assistant Sound Editor |
| Sound | Eric A. Larsen | Assistant Sound Editor |
| Sound | Smokey Cloud | Assistant Sound Editor |
| Art | Wayne McLaughlin | Property Master |
| Sound | Dennis Rogers | Sound Recordist |
| Production | Mark Sweatman | Production Assistant |
| Crew | Charles Andre | Stunts |
