Young doctor Garondet is summoned by renowned Professor Orloff. At Orloff's castle, Garondet discovers that the mad scientist has created an invisible yet murderous apeman.

• Célia Films
• Producciones Miguel Mezquíriz
• Howard Vernon
• Brigitte Carva
• Fernando Sancho
• Paco Valladares
• Eugène Berthier
• Isabel del Río
• Arlette Balkis
• May Chartrette