Marine Boy is the son of Dr. Mariner and is part of the the Ocean Patrol headquarters. His Marine suit is designed as bulletproof, and his ability to use his propelled boots. He also uses his electric boomerang to paralyze enemies and oxy-gum to breathe underwater without any diving gear.

He has friends such as Splasher, his pet dolphin, and Neptina, the mermaid with her ability to use her magic pearl for telepathy and invincibility to shine bright.

Marine Boy uses the P-1, a submarine craft with the help of his crewmen, Piper and Bolton.