Title Role(s) in episode
Season 1
"Neptune's Spatula" (tr) Debut; Major
Season 3
"Party Pooper Pants" (tr) In live-action at Patchy's party.
Season 4
"Krusty Towers" (tr) Cameo in painting
Season 5
"SpongeBob vs. The Patty Gadget" (tr) Cameo
"Atlantis SquarePantis" (tr) Cameo in painting
Season 6
"The Clash of Triton" (tr) Major
Season 8
"Hello Bikini Bottom!" (tr) Cameo during the opening song
Season 9
"It Came from Goo Lagoon" (tr) Cameo in sculpture
Season 10
"Trident Trouble" (tr) Major
Season 11
"High Sea Diving" (tr) Minor


Title Role(s) in episode
"The SpongeBob SquarePants Movie" (tr) Major, has a different design.

Video games

Title Role(s) for game
Battle for Bikini Bottom Summons SpongeBob and Patrick to the Poseidome to defeat a robot version of Sandy.
SpongeBob's Atlantis SquarePantis Cameo in sculpture

More Information

Neptune plays a central part in The SpongeBob SquarePants Movie. The movie also introduces Neptune's daughter, Princess Mindy. This version of Neptune is green-skinned and far more cartoony than the version in "Neptune's Spatula." He is also explicitly portrayed as a king rather than a god, and lives in a palace just outside of Bikini Bottom rather than Atlantis. This Neptune is very brutish and tyrannical, which he tells his daughter is necessary for him to be respected as a ruler. His crown is very important to him, not only because it is a symbol of his power, but because it covers his "thinning" (bald) head. When the crown is stolen by Plankton, Neptune attempts to execute Mr. Krabs, who is framed for the crime.

Old Neptune

King Neptune in the regular show


King Neptune in the first movie

Judging by his different appearances, it is reasonable conclude that Neptune is actually two different characters, with the first one referring to the Roman deity of the same name, and the second one works as the actual King of SpongeBob's underwater world. Their different places of living and the fact that he doesn't know SpongeBob and Princess Mindy only being in the movie reinforces this theory.

Another possible explanation is that he has gotten older from the show to the movie resulting in his loss of hair, because Stephen Hillenburg did establish that the movie does take place after the series.