The Moon Period lasted from late 1963 until Tracy's final Moon story in 1969 (which featured the official introduction of the Apparatus). Many of the plots during that time centered around Moon-based (or Moon-related) crimes,though Dick Tracy and the Major Crimes Unit also continued to face Earth-bound criminals and plots with no fantastical elements.
Characters and elements from the Moon Period (such at the magnetic Air Car) continued to appear in the strip until the death of Moon Maid in 1978. Following that, the only remaining evidence of the Moon Period to be depicted for some time was the appearance of Honeymoon Tracy.
- The Moon Period and its trappings diminished in the strip partly due to NASA's actual landing on the Moon, revealing it to be desolate and lifeless. Public interest in the Moon-based stories waned.
- Creator Chester Gould reportedly drew inspiration for some of the Moon Period technology from the animated television series "The Jetsons".
- The Moon Period is controversial among fans of the strip. Many fans consider it an unwelcome departure from the more traditional cops-and-robbers/procedural nature of the strip, while others praise the Moon Period for its creativity and artistic boldness.