This is the one that got its hooks in you before you knew the word anime, and it still works: bright, saturated color palettes on ocean floors that no live-action camera could have reached in 1969. Oxy-Gum, propeller boots, an electric boomerang, and a white dolphin named Splasher, a kid's arsenal that somehow makes total sense once you're twenty minutes into an Ocean Patrol run. Neptina and her pearl are the emotional core nobody expects to still land, and Dr. Mariner's lab hardware gives the whole thing that hand-drawn retro-futurist confidence. There's no grimdark undertow here, just clean adventure logic and undersea creature design that holds up better than half the stuff drawn thirty years later. Watch the water: the animators were solving problems no one had solved yet, and they knew it.

A boy dressed in a remarkable suit gains superpowers from it: he can breathe beneath the waves and talk with the creatures of the sea. In this expanded run of Marine Boy, his gear now includes a hydrojet and a boomerang built for use underwater, and the mermaid Neptuna has become his girlfriend. These 65 episodes add to the 1966 series and form a reworked, enlarged version of the first Marine Kid show, with part of the footage recycled from Ganbare! Marine Kid. The result is a sci-fi action adventure set among his undersea exploits.