The story is set around Doctor Frankenstein, and his assistant Ygor, the hunchback are finishing the creation of and bring to life the monster. Ygor quickly makes friends with the monster. He instructs the monster to kill Doctor Frankenstein, leaving him for dead. Ygor and monster leave the castle to explore. They meet a teenager, who also becomes friends with the monster. When the teenager makes fun of the hunchback, Ygor has the monster kill him. The pair return to the castle to find Doctor Frankenstein still alive. In the meantime, the brother of the teenage victim enters the castle seeking revenge. He sets the castle on fir, trapping inside the Doctor, Ygor and the monster.