
"Marine Boy" is produced in Japan but is intended for US audiences; it is one of the first color cartoons to come from Japan, soon to be sharing syndicated screen space with the likes of "Kimba the White Lion" and "Speed Racer."

Piper is captured by the fiendish Dr. Diablo; Diablo plans to save mankind from a future flood by installing gills in their bodies so they can live underwater.

Two master criminals escape from an underwater prison farm and use the P-1 as their getaway boat with Bullton and Piper as hostages.

Suddenly, the desert is flooded with seawater; the Ocean Patrol believes that someone is illegally mining uranium beneath the desert.

After a supposedly unsinkable nuclear vessel disappears in a storm, Marine Boy suspects sabotage and begins a search.