Guillermo del Toro told SCI FI Wire that if Hellboy II: The Golden Army is successful enough to warrant a sequel, he already has a plan in place for a third film in the series, and that the third film would be the last in the franchise.
Speaking with SCI FI Wire:
“If there was ever a third one, I would really make sure that we at least sign a contract that there is no more,” del Toro told SCI FI Wire. “No prequels and no sequels: nothing. If that happens, then there is a third one we have planned, and the seeds are planted in this film.”
Del Toro went on to explain that the third film would involve Hellboy going up against twenty-first century Nazis:
“It’s not this group of freakies that hide in the sewers, but people that are incredibly rich.”
Hellboy II: The Golden Army hits theaters on July 11th.
Source: SCI FI Wire