- Henri-Georges Clouzotdirector (as H.G. Clouzot)
- Henri-Georges Clouzotscenario (adaptation) (dialogue) &
- Jérôme Géronimiscenario (as Jérome Geronimi) (adaptation) (dialogue)
- Egon Hostovskynovel "Pulnocní pacient"
- Jean-Jacques Lécot(as Jean-Jacques Lecot)
- Patrick Dewaere(as Patrick Maurin)
- Sacha Pitoëff(as Sacha Pitoeff)
Rest of cast listed alphabetically
- Marc Arian(uncredited)
- Jack Ary(uncredited)
- Paul Bonifas(uncredited)
- Charles Bouillaud(uncredited)
- Henri Coutet(uncredited)
- Robert Dalban(uncredited)
- Jacques Hilling(uncredited)
- Henri-Georges Clouzotproducer (as H.G. Clouzot)
- Georges Lourauassociate producer
- Roger Boulaisproduction manager
- Louis de Masureproduction manager (as Louis de Masure)
- Philippe Sennéproduction manager (as Philippe Senne)
- Robert Ménégozassistant director (as Robert Menegoz)
- Michel Romanoffassistant director
- René Turbeauxproperty master
- Pierre Tybergheinassistant decorator
- Maurice Rémysound assistant
- William Robert Sivelsound (as W.R. Sivel)
- Arthur Van der Meerensound assistant
- Gilbert Chaincamera operator
- Walter Limotstill photographer
- René Touillaudlighting technician
- Ines Colignonassistant editor
- Jacques Météhenorchestra director (as Jacques Metehen)
- Denise Morlotscript girl
- O.E. Hassevoice dubbing: O.E. Hasse (german version) (uncredited)
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