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.
| Sound | Mark Snow | Original Music Composer |
| Writing | Jenny Seinen | Storyboard |
| Production | Chris Carter | Producer |
| Art | Paul Rinaldi | Construction Foreman |
| Camera | Bill Roe | Director of Photography |
| Production | Mindy Marin | Casting |
| Art | Tony Wohlgemuth | Art Direction |
| Costume & Make-Up | Scott Holburn | Set Dressing Artist |
| Writing | Chris Carter | Screenplay |
| Crew | Bill Terezakis | Makeup Effects |
| Crew | Maureen Terezakis | Makeup Effects |
| Crew | Paul Rabwin | Post Production Supervisor |
| Crew | E.J. Foerster | Second Unit |
| Costume & Make-Up | Raul Casillas | Set Dressing Artist |
| Production | Simon Abbott | Production Manager |
| Costume & Make-Up | Geoff Coulter | Set Dressing Artist |
| Sound | David Betancourt | Foley |
| Sound | David Giammarco | Sound Re-Recording Mixer |
| Writing | Frank Spotnitz | Screenplay |
| Editing | Richard A. Harris | Editor |
| Costume & Make-Up | Jared Brown | Set Dressing Artist |
| Sound | David Grimaldi | Sound Effects Editor |
| Art | Mark S. Freeborn | Production Design |
| Art | Shirley Inget | Set Decoration |
| Production | Wayne Bennett | Production Manager |
| Visual Effects | Glenn Curry | CG Painter |
| Crew | Jason Dunn | Compositors |
| Production | Heike Brandstatter | Casting |
| Crew | David McKimmie | Post-Production Manager |
| Art | Cheryl Marion | Assistant Art Director |
| Costume & Make-Up | Mark Prior | Set Dressing Artist |
| Costume & Make-Up | Lisa Tomczeszyn | Costume Design |
| Crew | Christopher Mark Pinhey | Makeup Effects |
| Production | Brent O'Connor | Unit Production Manager |
| Directing | Chris Carter | Director |
| Costume & Make-Up | Victoria Down | Makeup Department Head |
| Art | David Hadaway | Set Designer |
| Production | Coreen Mayrs | Casting |
| Costume & Make-Up | Sandy Monesmith | Hairstylist |
| Costume & Make-Up | Leonardo Lara | Set Dressing Artist |
| Visual Effects | Junji Hirano | CG Painter |
| Sound | David Lucarelli | ADR & Dubbing |
| Crew | David Alexander | CG Supervisor |
| Visual Effects | Steve Au | CG Painter |
| Crew | Charles Collyer | Compositors |
| Crew | Andrew Edwards | Compositors |
| Visual Effects | Daniel Leduc | Visual Effects Producer |
| Crew | Ryan Epp | Compositors |
| Crew | Don Greenberg | Compositors |
| Visual Effects | Joni Jacobson | Visual Effects Producer |
| Sound | Erin Michael Rettig | Sound Engineer |
| Crew | William Unrau | Cableman |
| Crew | Julio Pallares | Makeup Effects |
| Art | Mike Rennison | Construction Coordinator |
| Art | Sabine Schoppel | Art Department Coordinator |
| Sound | Alicia Stevenson | Foley |
| Crew | Rodrigo Armendariz | Compositors |
| Sound | Randall Guth | First Assistant Sound Editor |
| Sound | Martin Lacroix | Boom Operator |
| Visual Effects | Graham Houston | CG Painter |
| Visual Effects | Thomas F. Ford IV | Visual Effects Producer |
| Sound | Chuck Michael | Sound Designer |
| Sound | Charleen Richards-Steeves | ADR & Dubbing |
| Visual Effects | Mat Beck | Visual Effects Supervisor |
| Visual Effects | Andrew Lema | CG Painter |
| Sound | Paul Massey | Sound Re-Recording Mixer |
| Crew | David Gauthier | Special Effects Coordinator |
| Sound | Warren Hendriks | Sound Effects Editor |
| Crew | Michel Barrière | Compositors |
| Visual Effects | Anouk Deveault-Moreau | Visual Effects Supervisor |
| Crew | Mark Goldberg | Compositors |
| Crew | Linda Drake | Visual Effects Editor |
| Visual Effects | Brenda Ilic | Visual Effects Producer |
| Visual Effects | Tena Montoya | Visual Effects Producer |
| Visual Effects | Eugene Paluso | CG Painter |
| Crew | Christina Spring | Compositors |
| Visual Effects | John C. Wash | Visual Effects Supervisor |
| Crew | Guy Bews | Stunts |
| Crew | Dean Hart | Stunts |
| Crew | Matthias Lowry | Compositors |
| Visual Effects | Andrea Shear | CG Painter |
| Visual Effects | Randal Shore | Visual Effects Producer |
| Crew | Patrick Thompson | Compositors |
| Crew | Bill Edwards | Stunts |
| Crew | Corbin Fox | Stunts |
| Crew | Dave Lane | Stunts |
| Crew | Duane Dickinson | Stunts |
| Crew | Tony Morelli | Stunts Coordinator |
| Visual Effects | Jack Noriaki Matsumoto | CG Painter |
| Crew | Brian Petras | Compositors |
| Crew | Wayne A. Shepherd | Compositors |
| Crew | Jeff Sanca | Stunts |
| Crew | Richard Martin | Compositors |
| Visual Effects | Ian Wilson | CG Painter |
| Production | Dan Rucinski | Production Supervisor |
| Crew | Brian Sales | Compositors |
| Crew | Donald Tse | Compositors |
| Visual Effects | Dmitry Vinnik | CG Painter |
| Crew | Dave Williams | Compositors |
| Crew | Marty Taylor | Compositors |
| Crew | Chris Atkinson | Stunts |
| Crew | Mike Dobbin | Stunts |
| Crew | Mike Mitchell | Stunt Coordinator |
| Crew | Pierre Raymond | Executive Visual Effects Producer |
| Crew | Jennifer Mylrea | Stunts |
| Visual Effects | Trent Smith | Visual Effects Producer |
| Production | Anne Tremblay | Administration |
| Crew | Steve J. McLeod | Compositors |
| Crew | Vinay Mehta | Compositors |
| Crew | Mike Spring | Compositors |
| Crew | James Bamford | Stunts |
| Visual Effects | Rod Park | Visual Effects Producer |
| Crew | Marshall Virtue | Stunts |
| Crew | Chris Webb | Stunts |
| Lighting | Ryan Bailey | Gaffer |
| Production | Frank Spotnitz | Producer |
| Production | Brent O'Connor | Executive Producer |
| Crew | George Collins | Video Assist Operator |
| Crew | Natasha Vasiluk | Stunts |
| Camera | Mitch Bax | Camera Intern |
| Crew | Todd Scott | Stunts |
| Costume & Make-Up | Gitte Axen | Makeup Artist |
| Crew | Kimberly Chiang | Stunts |
| Crew | Melissa R. Stubbs | Stunts |
| Camera | Matt Almas | Grip |
| Art | Brad McMurray | Set Decorating Coordinator |
| Sound | Dennis Rogers | Sound Recordist |
| Sound | Mildred Iatrou | ADR Editor |
| Sound | Matthew Harrison | Foley Editor |
| Art | Marta McLaughlin | Assistant Property Master |
| Sound | Michael T. Williamson | Sound Mixer |
| Art | Wayne McLaughlin | Property Master |
| Sound | Scott Curtis | Foley Editor |
| Directing | Portia Tickell | Script Supervisor |
| Sound | Gloria D'Alessandro | Dialogue Editor |
| Sound | Eric A. Larsen | Assistant Sound Editor |
| Sound | Smokey Cloud | Assistant Sound Editor |
| Visual Effects | Bryce Brecheisen | Visual Effects Coordinator |
| Visual Effects | Shane Strickman | Visual Effects Coordinator |
| Sound | Galen Goodpaster | Assistant Sound Editor |
| Art | Eric Partridge | Assistant Property Master |
| Camera | John S. Bartley | Second Unit Director of Photography |
| Camera | Cory Budney | First Assistant Camera |
| Sound | Tim Gomillion | Sound Recordist |
| Production | Mark Sweatman | Production Assistant |
| Crew | Charles Andre | Stunts |
