Fact1: Mayor allows them to destroy Frankenstein 's castle, Fact2: monster returns girl to father, Fact3: town prosecutor asks him to examine giant, Fact4: Ygor implores Ludwig to heal monster 's body and brain, Fact5: spirit implores him to supply monster with good brain
Output: The residents of the village of Frankenstein feel they are under a curse and blame all their troubles on Frankensteins monster. The Mayor allows them to destroy Frankensteins castle. Ygor finds the monster released from his sulfuric tomb by the explosions. The exposure to the sulfur weakened yet preserved the monster. Ygor and the monster flee the castle, and the monster is struck by a bolt of lightning. Ygor decides to find Ludwig, the second son of Henry Frankenstein, to help the monster regain his strength. Ludwig Frankenstein is a doctor who, along with his assistants Dr. Kettering and Dr. Theodore Bohmer, has a successful practice in Visaria. Bohmer was formerly Ludwigs teacher but is now his envious assistant. Ygor and the monster arrive in Vasaria, where the monster befriends a young girl, Cloestine Hussman. The monster carries her onto a roof to retrieve her ball, killing two villagers who attempt to intervene. After Cloestine asks the monster to bring her back down, the monster returns the girl to her father Herr Hussman and is immediately captured by police. The town prosecutor, Erik Ernst, comes to Ludwig and asks him to examine the giant they have captured. Ygor then visits Ludwig and informs him that the giant is the monster. Ygor implores Ludwig to heal the monsters body and brain. Ludwig refuses, but Ygor threatens to reveal Ludwigs ancestry to the villagers. At the police station, the monster is restrained with chains as a hearing is conducted to investigate the murder of the villagers. When Ludwig denies recognizing the monster, it breaks free in a fit of rage, and is led away by Ygor. Elsa, Ludwigs daughter, finds the Frankenstein journals and learns the story of the monster. She sees Ygor and the monster in the window, and after breaking into Ludwigs laboratory, the monster kills Dr. Kettering. The monster grabs Elsa, but Ludwig is able to subdue him with knockout gas. Ludwig is examining the monster when it awakens and tries to kill him. Ludwig tranquilizes the monster and then tries to enlist Bohmers aid in dissecting him. Bohmer refuses, claiming it would be murder. While studying his familys journals, Ludwig is visited by the ghost of his father Henry Frankenstein. The spirit implores him to supply the monster with a good brain. Ludwig calls in Bohmer and Ygor and tells them that he plans to put Dr. Ketterings brain into the monsters skull. Ygor protests and asks Ludwig to use his brain, but Ludwig refuses because of Ygors sinister nature. Elsa begs Ludwig to stop his experiments, but he chooses to operate on the monster as soon as possible. Ygor tells Bohmer that he should not be subordinate to Ludwig. Ygor promises to help the disgraced doctor if he agrees to put Ygors brain into the monster. The police soon arrive at Ludwigs house, searching for the monster. They find the secret room, but Ygor and the monster have fled. The monster abducts Cloestine from her home and returns with her in his arms to Ludwigs chateau. The monster conveys his desire for her brain to be placed in his head. Cloestine does not want to lose her brain, and the monster reluctantly gives her to Elsa. Ludwig then performs the surgery, not knowing that Bohmer has replaced Ketterings brain with Ygors. In the village, Herr Hussman rouses his neighbors by telling them his daughter has been captured by the monster and that Ludwig is harboring it. Ludwig shows the monster to Erik, but when the monster rises, Ludwig is shocked to hear that it has Ygors voice. The villagers storm the chateau and the YgorMonster decides to have Bohmer fill the house with gas to kill them. Ludwig tries to stop him, but the YgorMonster repels the attack and mortally wounds Ludwig. The YgorMonster suddenly goes blind. The wounded Ludwig explains that the blindness is a result of the incompatibility between the blood types of Ygor and the monster. Feeling betrayed, the YgorMonster then throws Bohmer onto the apparatus, electrocuting him, and inadvertently sets fire to the chateau. The YgorMonster becomes trapped in the burning chateau while Erik and Elsa escape, walking out into the sunrise.