King Neptune is a 1932 cartoon by Walt Disney, the second in the Silly Symphonies series produced in Technicolor. While Flowers and Trees was originally intended as a black and white cartoon, King Neptune was meant to be in colors already from the start, and was able to take full advantage of this.

While the film is included in the 1980s VHS release of Silly Symphonies and the Walt Disney Treasures DVD, it was not selected for the Platinum Edition DVD collection, because of mermaid nudity and heavy drinking (as the film was targeting adult audiences). While the mermaids lack anatomical detail, they may be considered inappropriate for a modern audience.