A folklore professor becomes unwittingly possessed by the ancient Japanese demons of Thunder and Lightning. But when The Bureau of Paranormal Research & Defense dispatches a team of agents to investigate, a cursed samurai sword sends Hellboy to a supernatural … Ron Perlman, Selma Blair, Doug Jones, Peri Gilpin, Gwendoline Yeo, Dee Bradley Baker, Phil LaMarr Added on Amazon Prime 2023-08-21. Youtube Trailer