Saturday Morning Cartoons: King Leonardo and His Short Subjects by Ray Schuck · Published February 20, 2021 · Updated February 20, 2021 This week’s edition of Saturday Morning Cartoons features the theme song from King Leonardo and His Short Subjects, which originally aired on NBC from 1960 to 1963. How do you rate this post? Click on a star to rate it! Submit Rating Average rating 0 / 5. Vote count: 0 No votes so far! Be the first to rate this post.