The "Inner Sanctum" franchise originated with a popular radio series and all of the films star Lon Chaney Jr. It was the only entry in the series to dispense with the introduction by a disembodied head in a crystal ball, as well as the only one to feature comic-relief characters to alleviate the grim tone.
The "Inner Sanctum" franchise began with a well-known radio series, and all of its films starred Lon Chaney Jr. It was the unique entry that did not include the introduction by an unseen head in a crystal ball and featured humorous roles to offset the grim atmosphere.