Two hours of ocean and it never once feels like a kids' cartoon babysitting you. This is the 1972 Tezuka series squeezed into a re-edit, which means Tomino's earliest instincts hit you in a concentrated dose: a blue-haired boy with a crescent on his forehead, an Orichalcum dagger, and a war with the Poseidon tribe that keeps insisting there is a right side to be on. Triton and Fin cutting through open water is still one of the purest images in 70s adventure animation, and the compilation format strips out the filler until only the momentum is left. What makes it cult is what the story eventually does to the word hero. You come for a boy and his dolphin. You leave doing math about who actually started it.
A human boy and a merman prince forge an unlikely bond when they meet in the depths of the ocean. Triton, heir to an underwater kingdom, swims through treacherous waters seeking his lost father while protecting the secrets of the sea from those who would exploit them. When a shipwrecked child crosses his path, Triton sees an opportunity to understand the surface world he's long been curious about. Their friendship becomes complicated when human ambition and oceanic magic collide. Industrial forces want to drain the sea for profit. Ancient enemies resurface with their own claims to power. Triton must decide whether to hide behind his crown or fight to protect both worlds, even knowing that some bonds can't survive the divide between air and water. The film balances wonder and danger, offering adventure that feels genuinely perilous. Stunning animation brings coral kingdoms and open ocean to vivid life, while the central relationship grounds the mythology in something real. This is fantasy that doesn't apologize for its strangeness, perfect for viewers drawn to worlds that operate by their own logic.