In this horror classic, Dr. Frankenstein (Colin Clive) and ghoulish assistant Fritz (Dwight Frye) create an artificial being from human body parts, and the resulting creature is a subhuman monster (Boris Karloff). Frankenstein, unable to deal with the monster's behavior, locks him in a dungeon and leaves him in the care of Fritz, who tortures the creature. Tired of it, the monster breaks free and unleashes his deadly force. Can he be stopped?