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The film's story begins in the year 1944, during a covert military operation in Scotland. A group of soldiers confronts German General's right-hand man, Carl, and a mystic named Gregori, who plans to open a portal to allow the seven gods of chaos—Ogdru Jahad—to enter the Earth and wreak havoc. Trevor Broom, the scientist who plays a pivotal role in the story, throws a grenade to thwart this dark plan but inadvertently becomes the adopted father of a baby demon when a smaller version of a demon creature, later named Hellboy, is discovered in the aftermath of the explosion.