Sequel to 'Son of Frankenstein' (1939). Wicked shepherd Ygor (Bela Lugosi) seeks out Dr Ludwig Frankenstein (Cedric Hardwicke), son of the original Baron, in an attempt to revive the infamous monster (Lon Chaney Jr, inheriting the role from Boris Karloff). Ludwig initially refuses, seeing the creature as an instrument of evil, but changes his mind when he sees the opportunity to transplant the noble mind of the recently deceased Dr Kettering into the monster's body. Ygor, however, has other plans, and plots with Victor's unscrupulous colleague Dr Bohmer to substitute his own brain for Kettering's. Followed by 'Frankenstein Meets the Wolf Man' (1943).

Double feature starring Basil Rathbone as detective Sherlock Holmes. In 'The Adventures of Sherlock Holmes' (1939), Professor Moriarity (George Zucco) has come up with a scheme for stealing the crown jewels from the Tower of London. To get Holmes involved, he persuades a flute player to murder a girl. In 'Sherlock Holmes and the Secret Weapon' (1943), Holmes travels to Switzerland to rescue the inventor of a bomb-sight which the allies want to keep from the Nazis. Back in London, however, it turns out that the inventor is not all that he seemed...