| Person | Type | Job | Role(s) |
|---|---|---|---|
 Art Vitello | Crew | Visual Effects | Animation Director |
 Guillermo del Toro | Crew | Writing | Creative Producer |
 Lawrence Gordon | Crew | Production | Executive Producer |
Lloyd Levin | Crew | Production | Executive Producer |
Michael Wolf | Crew | Production | Executive Producer |
 Mike Mignola | Crew | Writing | Characters, Story, Consulting Producer |
 Mike Richardson | Crew | Production | Executive Producer |
Phil Weinstein | Crew | Directing | Director |
Stephen R. Brown | Crew | Production | Executive Producer |
 Tad Stones | Crew | Directing | Director, Screenplay, Story, Supervising Producer |
Christopher Drake | Crew | Sound | Original Music Composer |
John Hoyos | Crew | Editing | Editor |
Karen Inwood Somers | Crew | Crew | Documentation & Support, Screenplay |
Matthew Waynee | Crew | Writing | Screenplay |
Morris Berger | Crew | Production | Executive Producer |
Scott Greenberg | Crew | Production | Producer |
Sidney Clifton | Crew | Production | Producer |
Bryndon Smith | Crew | Camera | Camera Operator |
John W. Hyde | Crew | Production | Executive Producer |
Scott Hemming | Crew | Production | Executive Producer |
Jeffrey Perlmutter | Crew | Editing | Editor |
Stephanie Elliott | Crew | Production | Producer |
 Clyde Kusatsu | Cast | Actor | Additional Voices (voice) |
 Dee Bradley Baker | Cast | Actor | Lightning / Kappa / Pilot (voice) |
 Doug Jones | Cast | Actor | Abe Sapien (voice) |
 James Sie | Cast | Actor | Additional Voices (voice) |
 Liza del Mundo | Cast | Actress | Additional Voices (voice) |
 Michael Hagiwara | Cast | Actor | Additional Voices (voice) |
 Mitchell Whitfield | Cast | Actor | Russell Thorne (voice) |
 Peri Gilpin | Cast | Actress | Professor Kate Corrigan (voice) |
 Phil LaMarr | Cast | Actor | Bureau Member / Pilot / Additional Voices (voice) |
 Ron Perlman | Cast | Actor | Hellboy (voice) |
 Selma Blair | Cast | Actress | Liz Sherman (voice) |
 Gwendoline Yeo | Cast | Actress | Kitsune (voice) |
 Paul Nakauchi | Cast | Actor | Additional Voices (voice) |
 Kim Mai Guest | Cast | Actress | Additional Voices (voice) |
 Yuriana Kim | Cast | Actress | Additional Voices (voice) |
| Person | Type | Job | Role(s) |
