Poseidon is a supporting character in DC Comics' in Aquaman and Wonder Woman. Poseidon is one of the three eldest gods among the Gods of Olympus (alongside his brothers Zeus and Hades) and ruler of the seas.
Poseidon was first adapted for the DC Universe by Gardner Fox and Sheldon Moldoff and debuted in Flash Comics #9 (1940). He is based on the Greek god of the same name.