The Devil and Mr. O is a syndicated horror radio series, created by Arch Oboler as a part of the famous Lights Out series of radio programs. Premiering in 1935, Lights Out was known as "the ultimate in horror," and captivated listeners with its gruesome sound effects and macabre storylines. The show was originally created, written, and produced by Wyllis Cooper, who utilized everyday objects to create horrifying auditory experiences for the audience.

In 1936, Arch Oboler took over as the showrunner and further established his reputation as a master of the macabre. Between May 1936 and July 1938, Oboler wrote and directed more than 100 Lights Out plays, with many of them later included in The Devil and Mr. O syndication, aired from 1970-73.

As the host of the show, Arch Oboler, also known as Mr. O., introduced the episodes, each one offering a different horror story to draw in and frighten the listener. Episodes such as "Alley Cat" and "Where are You" exemplify the terrifying situations and sound effects that characterize the series, which focused on themes of mayhem, murder, and much more. The Devil and Mr. O promises to captivate listeners with its chilling narratives and unique approach to horror storytelling.