"Originally it was supposed to be Karloff in Ridges' role with Lugosi as his supporting doctor. However director Arthur Lubin felt that Karloff's gangster persona was unconvincing and so placed him in the role of Ernest Sovac. This sadly means that Lugosi is pushed into a very meaningless gangster role... But even with my slight issues with casting and direction choices, Black Friday is a fantastic movie. Its hour long runtime means that the film never outstays its welcome, even though there is enough intrigue and suspense to fill out 90 minutes. It has this wonderful Twilight Zone feel to the story (even though it predates it) and it will keep you guessing right up until the last moments of the film. The two central performances are very good and although it's a waste of Lugosi, he still does a fine job." - Luke Owen, Flickering Myth