The Black Sleep

In 19th century England, a noted brain surgeon rescues a former student from being hanged on a false conviction for murder, and spirits him away to an ancient, repurposed abbey far in the countryside. There, he connives his pupil into assisting him in mapping the functions of the various parts of the human brain, using living subjects who are under a terrible animation-suspending drug called "black sleep". Subsequently, the student, along with the daughter of one of the subjects, discover that most of these subjects have survived but are being kept in a dungeon-like cellar, in various stages of physical and mental derangement...

• 
  Basil Rathbone

  Sir Joel Cadman
• 
  Herbert Rudley

  Dr. Gordon Ramsay
• 
  Patricia Blair

  Laurie Munroe
• 
  Akim Tamiroff

  Odo the Gypsy
• 
  Phyllis Stanley

  Daphne
• 
  Lon Chaney Jr.

  Dr. Munroe, aka Mungo
• 
  Bela Lugosi

  Casimir
• 
  John Carradine

  Bohemund
• 
  George Sawaya

  Sailor-Subject
• 
  Tor Johnson

  Mr. Curry