"Son of Frankenstein" is a 1939 horror film and the third installment in the original Frankenstein series. Directed by Rowland V. Lee, it follows the story of Henry Frankenstein's son, Wolfgang, who returns to his father's castle. He seeks to redeem his family's name but becomes entangled in the legacy of the Frankenstein Monster. In the film, Wolfgang discovers the monster is still alive and attempts to control it. He is aided by Ygor, a deformed assistant who has his own plans. The movie explores themes of legacy, responsibility, and the consequences of scientific ambition.