Actress Grace Carney provided the voice of Rocky's wife, Mabel, who was never seen on camera. This practice originated on an early episode when Carney, who was hired for another role, was asked to double as Rocky's wife. Since there was no time for wardrobe or makeup changes, she acted the part in voice only, with Roscoe Karns ad-libbing to his off-screen wife. Viewers liked the idea, and Carney continued unseen for the rest of the series' five-year run. They also had a son - also heard, but never seen - called "Junior."
This was one of the most popular and long-running programs on the short-lived DuMont Television Network, which folded in 1955. The long, dark corridors through which "Rocky King" walked at the beginning and end of the show were actual backstage hallways at the DuMont Tele-Centre in New York City.