The Ron Perlman-led Hellboy films didn't win awards nor did the pair of movies ever hit it big at the global box office. Nevertheless, fans loved Perlman's live-action portrayal of the Dark Horse Comics character while Guillermo del Toro tried to do the source material justice. The duo's efforts were popular enough among audiences - it also helped that 2008's Hellboy II: The Golden Army did well financially - to warrant a third film.
Unfortunately, Hellboy 3 never happened despite entering pre-production in 2008. But, despite the ill-fated demise of the third Hellboy film, it appears that the lead star is still keen on reprising his former role at the age of 71.
Perlman's Hellboy, just like the comic book character of the same name, was a demon raised by humans to work for the FBI's Bureau for Paranormal Research and Defense (BPRD), to eliminate non-convenient threats from other worlds. The third film, as revealed by del Toro, would have seen Big Red accept his destiny as the "Beast of the Apocalypse". Del Toro claimed that he always planned to do a trilogy, with Hellboy 3 giving Perlman's character a definitive end.
There's no indication yet that del Toro still wants to do Hellboy 3, but if Perlman, as revealed in a The Independent interview, is on board, who knows? Perlman's statement is pretty clear, saying that he wasn't eager to do Hellboy 3 because of his age but he wants to do it because he and Guillermo "owe this to the fans."