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).

1960s black comedy horror starring Lon Chaney Jr. Chauffeur Bruno (Chaney Jr.) watches over Virginia (Jill Banner), Ralph (Sid Haig) and Elizabeth (Beverly Washburn), the three inbred, grown-up children of the Merrye family who have inherited a genetic condition which turns them into demented, feral beings. While Peter (Quinn Redeker) and Emily (Carol Ohmart), who have come to claim the Merrye mansion as their own, are visiting, Bruno has to leave the house for a short time. The siblings take the opportunity to wreak havoc and when Bruno returns he realises he must go to drastic measures to stop the 'Merrye Syndrome' from spreading.