The small town of Wydeburn (it seems to only have 20 residents) is controlled by the feuding DeSade family. The good warlock Andre (John Carradine) controls half the citizens and bad warlock Belial (Lon Chaney) rules the others. Andre tells us that Belial has a cloven hoof but we never see it. Chaney's limp is no doubt due to an attack of gout which he was plagued with for the last years of his life. He does sport a nice pair of horns though. Another member of the family is supposed to be a werewolf and to be fair we do get a brief insert shot of the man wearing what is meant (I guess) to be a werewolf mask! Another DeSade brother (Tom Drake, who costarred with Chaney in THE CYCLOPS back in 1957) comes home with a doctor colleague (Andrea King, best remembered from THE BEAST WITH FIVE FINGERS) to save his sister (Delores Faith) from what he believes is the family madness. Without spoiling too much of the plot (actually the directors did that themselves!) he soon learns that not all of Life's mysteries can be explained away in medical books!
Continuity is barely there and scenes jump around so much you have to wonder who did the editing. At one moment Carradine declares he is tired and must rest yet in the very next scene he is in the living room talking about the family history! Watch how Delores Faith is wearing high heels when she leaves Carradine's house but is barefoot when she arrives at Chaney's place. Everyone I this picture had experience with the genre and I can only assume they did the best they could with a budget that from probably non existent from Day One and three directors all going in different directions. Katherine Victor from THE CAPE CANAVERAL MONSTERS shows up long enough to initiate a new member into Belial's coven. One name "Adults Only" star Sabrina (qv THE ICE HOUSE)shows up as a harem dancer.
If you think Roger Corman's THE TERROR (1963) is all over the map plotwise sit down and try to watch this movie! It's too incoherent to even to be funny. Oh well, call me a completist but I'll watch anything with Lon and John in it. Nice try, guys.