The friends Emmett, Freddy, Marie, Kevin and his reluctant girlfriend Jessie decide to spend the Halloween night in an abandoned hospital. Meanwhile, the younger Allan meets the old friend of his father Arlo Ray Baines and asks him to help to find his vanished sister Meg in the same spot. The two groups meet each other in the mental institution section on the haunted third floor.
Unfortunately the movie Boo is not yet available on HBO Max.
| Directing | Anthony C. Ferrante | Director |
| Writing | Anthony C. Ferrante | Writer |
| Production | David E. Allen | Producer |
| Production | Sheri Bryant | Co-Producer |
| Production | Harmon Kaslow | Executive Producer |
| Production | Brian Patrick O'Toole | Co-Producer |
| Production | Dennis Sugasawara | Line Producer |
| Sound | Alan Howarth | Original Music Composer |
| Camera | Nick Franco | Director of Photography |
| Crew | Carl Bartels | Cinematography |
| Editing | Chris Conlee | Editor |
| Production | Lisa Essary | Casting |
| Art | Sam Greenmun | Production Design |
| Art | John Stewart | Art Direction |
| Costume & Make-Up | Jeannette M. Fuller | Costume Design |
| Costume & Make-Up | Misa Aikawa | Key Makeup Artist |
| Crew | David A. Brooke | Makeup Effects |
| Costume & Make-Up | Tracy Wilcox Gillie | Key Makeup Artist |
| Costume & Make-Up | Lorraine Martin | Makeup Department Head |
| Crew | Kevin Wasner | Makeup Effects |
| Directing | Mike Greene | First Assistant Director |
| Directing | Shelly Heyward | Second Assistant Director |
| Directing | Keith Jones | First Assistant Director |
| Directing | Eli Olson | Second Assistant Director |
| Crew | Scott Gerard | Carpenter |
| Art | Sam Greenmun | Art Designer |
| Crew | Damon Anthony Guilfoyle | Carpenter |
| Crew | Mike Horn | Carpenter |
| Art | Todd Knowlton | Property Master |
| Crew | Andre D. Munoz | Carpenter |
| Art | Louis Pantelakos Jr. | Set Dresser |
| Crew | Craig Wadlin | Carpenter |
| Sound | Marcus Andexler | Sound Recordist |
| Sound | Ben Cooper | Sound Designer |
| Sound | Joel Jaffe | Foley Editor |
| Sound | Shawn Keating | Sound Designer |
| Sound | J.M. Logan | Sound Designer |
| Sound | Michael J. McDonald | Supervising Sound Editor |
| Sound | Alex Ullrich | Foley Artist |
| Sound | Benjamin Vallery | Boom Operator |
| Sound | Brad Whitcanack | Sound Effects Editor |
| Crew | John Bordeaux | Special Effects Coordinator |
| Visual Effects | Michael Shelton | Visual Effects Supervisor |
| Crew | John Stewart | Compositor |
| Crew | Charlie Parrish | Stunt Coordinator |
| Crew | Danny Wayne | Stunt Coordinator |
| Lighting | Jose Aguirre | Electrician |
| Camera | Robert Baird | First Assistant Camera |
| Lighting | Brian M. Fisher | Gaffer |
| Camera | Richard E. Garcia | First Assistant Camera |
| Camera | Amos James | Key Grip |
| Camera | Dominic Mainl | First Assistant Camera |
| Lighting | Justin Maresch | Electrician |
| Camera | Kelsey Shaw McNeal | Still Photographer |
| Camera | Richard Moriarty | First Assistant Camera |
| Camera | Scott Probe | Dolly Grip |
| Editing | Vinny Ciminera | Colorist |
| Crew | Kathy Abbott | Studio Teacher |
| Crew | Guy Flint | Studio Teacher |
| Directing | Sherry Gunderman | Script Supervisor |
| Production | Sybille Herwig | Production Coordinator |
| Crew | Jan Turetsky | Studio Teacher |
| Crew | Dutchess Botti-Smith | In Memory Of |
