Following a brutal series of murders taking place on Halloween, Thanksgiving, and Christmas, Gotham City's young vigilante known as the Batman sets out to pursue the mysterious serial killer alongside police officer James Gordon and district attorney Harvey Dent.
Unfortunately the movie Batman: The Long Halloween, Part One is not yet available on HBO Max.
| Writing | Bill Finger | Characters |
| Directing | Chris Palmer | Director |
| Production | James Krieg | Producer |
| Production | Kimberly S. Moreau | Producer |
| Production | Butch Lukic | Supervising Producer |
| Production | Michael Uslan | Executive Producer |
| Production | Sam Register | Executive Producer |
| Production | Wes Gleason | Casting |
| Editing | Bruce King | Editor |
| Production | Marlene Corpuz | Production Manager |
| Visual Effects | Jon Suzuki | Character Designer |
| Sound | Michael Gatt | Original Music Composer |
| Writing | Tim Sheridan | Writer |
| Writing | Jeph Loeb | Graphic Novel |
| Writing | Tim Sale | Graphic Novel |
| Crew | Naya Rivera | In Memory Of |
| Writing | Frank Miller | Characters |
| Writing | David Mazzucchelli | Characters |
| Production | Alicia Heraper | Assistant Production Manager |
| Visual Effects | Cathlin Hidalgo-Polvani | Character Designer |
| Visual Effects | Dou Hong | Character Designer |
| Visual Effects | Irineo Maramba | Character Designer |
| Visual Effects | Otto Schmidt | Character Designer |
| Art | Adrian Barrios | Storyboard Artist |
| Art | Vinton Heuck | Storyboard Artist |
| Art | Arthur Lee | Prop Designer |
| Art | Chad Townsend | Prop Designer |
| Art | Brian Uchida | Prop Designer |
| Art | Augusto Barranco | Background Designer |
| Art | Elliot Byrne | Background Designer |
| Art | Rodel Gravo | Background Designer |
| Art | Tec Manalac | Background Designer |
| Art | Kenny McGill | Background Designer |
| Art | Assaf Meir | Background Designer |
| Art | Roger Oda | Background Designer |
| Art | John Paik | Background Designer |
| Art | Clarke Snyder | Background Designer |
| Art | George Stokes | Background Designer |
| Art | Cameron Thompson | Background Designer |
| Art | Vince Toyama | Background Designer |
| Art | Doug Walker | Background Designer |
| Visual Effects | Kim Bowen | Color Designer |
| Visual Effects | Victoria Thornberry | Color Designer |
| Art | Ethan Becker | Storyboard Artist |
| Art | Gabo Camarillo Gil | Storyboard Artist |
| Art | Tim Divar | Storyboard Artist |
| Art | Elsa Garagarza | Storyboard Artist |
| Art | Eugene Lee | Storyboard Artist |
| Art | David Maximo | Storyboard Artist |
| Art | Sam Montes | Storyboard Artist |
| Art | Albert Park | Storyboard Artist |
| Art | Sung Shin | Storyboard Artist |
| Art | Bob Smith | Storyboard Artist |
| Art | Carli Squitieri | Storyboard Artist |
| Art | Jose Andres Velasco | Storyboard Artist |
| Art | Rozlynn Waltz | Storyboard Artist |
| Art | Jeff Wamester | Storyboard Artist |
| Art | Matthew Girardi | Art Direction |
| Visual Effects | Anthony Akira Andrade | Animation |
| Visual Effects | Brett Hardin | Animation |
| Visual Effects | Aric Mannion | Animation |
| Sound | Mark A. Keatts | Supervising Dialogue Editor |
| Sound | David M. Cowan | ADR Editor |
| Sound | David M. Cowan | Dialogue Editor |
| Sound | Patrick J. Foley | ADR Editor |
| Sound | Patrick J. Foley | Dialogue Editor |
| Sound | Kelly Ann Foley | ADR Editor |
| Sound | Kelly Ann Foley | Dialogue Editor |
| Sound | Michael Garcia | ADR Editor |
| Sound | Michael Garcia | Dialogue Editor |
| Editing | Darren Griffiths | Online Editor |
| Production | Bobbie Page | Production Supervisor |
| Production | Ed Adams | Production Manager |
| Production | Peter Girardi | Executive In Charge Of Production |
| Production | Brian E.S. Jones | Executive In Charge Of Production |
| Production | Angela O'Sullivan | Line Producer |
| Sound | Mark A. Keatts | Supervising ADR Editor |
| Art | Brenna Kraus | Graphic Designer |
| Art | Brenna Kraus | Title Designer |
| Art | Adrienne Steinbaum | Graphic Designer |
| Art | Adrienne Steinbaum | Title Designer |
| Art | Aren Williams | Graphic Designer |
| Art | Aren Williams | Title Designer |
| Production | Kip Brown | Post Producer |
| Production | Julie Osborn | Post Producer |
| Visual Effects | Sharon Yvonne Lopez | Visual Effects Production Manager |
| Editing | Harrison T. Barth | Assistant Editor |
| Editing | Michele Beeson | Assistant Editor |
| Editing | Gabriel Gianola | Assistant Editor |
| Writing | Bob Kane | Characters |
