Aquaman is a DC comics superhero who debuted in More Fun Comics in 1941. He subsequently became the star of his own comic books series (Volume 1: 1962-1971, 1977-78; Volume 2: 1991-1992, Volume 3: 1994-2001; Volume 4: 2003-2007). Other spin-offs include animated cartoon show Aquaman (1967-1970) and a 2006 pilot for a TV show (trailer below).
Aquaman parallels Superman and other flying superheroes: while they dominate the skies, defying gravity, he speeds through the ocean. Often his enemies are ocean-related villains that threaten aquatic life: shipping, sailors, etc..