The Devil and Mr. O was a horror radio program that was part of the famed Lights Out series, which had already become well-known for its graphic sounds of murder and gore. Created by Arch Oboler, the show featured eerie and fantastical stories that combined dialogues, storylines, and sound effects to captivate and draw in listeners. Oboler served as the host for the program, taking on the persona of "Mr. O" and setting an intense and captivating tone that kept listeners on the edge of their seats.

The show aired during the early 1940s, with Arch Oboler hosting from 1942 to 1943. It was a transcribed syndication of original broadcasts from the Lights Out series. Several episodes of Oboler's shows, including The Devil and Mr. O, were repackaged for syndication and aired from 1970 - 73. The radio program showcased Oboler's talents in creating suspenseful and horrifying narratives that demanded the audience's full attention.

Sources: archive.org, otrcat.com