One of many episodes solely credited to Charles Beaumont, though due to Beaumont's failing health, Jerry Sohl was his ghostwriter. Beaumont plotted this episode with Sohl, the screenwriter.
Martin Balsam (Martin Lombard Senescu) would later play Rockne S. O'Bannon in Gramma/Personal Demons/Cold Reading (1986) and Professor Donald Knowles in Time and Teresa Golowitz/Voices in the Earth (1987).
Henri Désiré Landru (12 April 1869 - 25 February 1922) was a French serial killer, nicknamed the Bluebeard of Gambais. He murdered at least seven women in the village of Gambais between December 1915 and January 1919. Landru also killed at least three other women and a young man in the house he rented from December 1914 to August 1915 in the town of Vernouillet, a town 35 km northwest of Paris. The true number of Landru's victims is suspected to be higher.