Guillermo del Toro
réalisateur
scénariste
Mike Mignola
Peter Briggs
Ron Perlman
Hellboy
John Hurt
Prof. Bruttenholm
Selma Blair
Liz Sherman
Rupert Evans
John Myers
Jeffrey Tambor
Tom Manning
Doug Jones
Abe Sapien
Karel Roden
Grigori Rasputin
Brian Steele
Sammael
Ladislav Beran
Karl Ruprecht Kroenen
Biddy Hodson
Ilsa Haupstein
Corey Johnson
Agent Clay
Brian Caspe
Agent Lime
James Babson
Agent Moss
Ellen Savaria
Blonde Television Reporter
Kevin Trainor
Young "Broom"
Stephen Fisher
Agent Quarry
Garth Cooper
Agent Stone
Angus MacInnes
Sgt. Whitman
Jim Howick
Cpl. Matlin
Rory Copus
Kid on Rooftop
Santiago Segura
Train Driver
Mark Taylor
Truck Driver
David Hyde Pierce
Abe Sapien (voix) (non-crédité)
Daniel Aarsman
Kid
Bettina Ask
Alvaro Navarro
Emilio Navarro
Tara Hugo
Doctor Jenkins
Richard Haas
Second Doctor
Andrea Miltner
Doctor Marsh
Andrea Stuart
Girl with Kittens
Millie Wilkie
Young Liz
Bob Sherman
Television Host
Winter Ave Zoli
Girlfriend
Guy Dressed as Dragon (non-crédité)