Premise: Son of Frankenstein is a 1939 horror film directed by Rowland V. Lee, and is the third entry in Universal Studios' "Frankenstein" series and the last to feature Boris Karloff as the Monster. It is also the first to feature Bela Lugosi as Ygor. The film is the sequel to James Whale's "Bride of Frankenstein", and stars Karloff,
Hypothesis: Son of Frankenstein is a sequal