King Neptune, born 5,000 years ago, is the Spongebob depiction of Neptune, the Roman god of the sea. In the universe of SpongeBob SquarePants, Neptune is the god and supreme ruler of the sea. His name is often used in place of God's, with phrases such as "Dear Neptune," "Neptune preserve her!," and "Oh my Neptune!" However, he has never explicitly been shown to be worshiped by the creatures of the sea.
King Neptune first appeared in the episode "Neptune's Spatula," and reappeared in The SpongeBob SquarePants Movie, but revealed he was bald in the latter. He played yet another major role in the season 6 episode "The Clash of Triton." He also made an appearance in the Spongebob game, The Battle For Bikini Bottom, having been a host of the Posidome when Spongebob and Patrick faced off against a massive Sandy robot. Neptune is voiced by John O'Hurley in the T.V. series and by Jeffrey Tambor in the first movie. His Greek counterpart is Poseidon and he has a wife, one son, and two daughters.