Hippocampus, more commonly known as seahorse, is the genus of Mystery.




The green version of a seahorse appears in the episode "My Pretty Seahorse." Her role in the episode is as SpongeBob's temporary pet after she develops an interest in the flowers SpongeBob plants in celebration of spring beginning.

For a while, SpongeBob considered naming her Grace, Majesty, or maybe even Debbie, but finally decided upon the name Mystery. Her name matches because if she eats something and walks away, then nobody knows and it's a mystery problem. However, in the Krusty Krab, she eats flowers, Krabby Patties, Old Man Jenkins, SpongeBob's spatula, the stove, SpongeBob's work hat, SpongeBob's floral bookmark, and Mr. Krabs' money.

Mr. Krabs doesn't like Mystery, and wants SpongeBob to let her go, although SpongeBob lies about Mystery having a stomachache. He is afraid for Mystery to go, but Mr. Krabs tells him a story about when he spent his first dollar to convince him that it's for his own good, and finally agrees with him.

Mystery is then let go by SpongeBob, albeit reluctantly. Soon, Squidward notices that she ate the bank, and SpongeBob and Mr. Krabs start chasing after her, yelling at her to come back.


Purple seahorses appear in "Neptune's Spatula." They are summoned by King Neptune and bring him an apron to wear. An emblem of a purple seahorse can be seen on Neptune's belt buckle in every episode that physically features him.


The orange version of the seahorse appears in The SpongeBob SquarePants Movie. Their role in the movie are as dead fish who are killed by the Cyclops.


The gray version of seahorse only appears as an illustration on a Seahorse Radish jar in the episode "Nasty Patty."


They are wild animals that mostly reside in Jellyfish Fields.[1]

Mystery temporarily lived at SpongeBob's house.[2]

Two seahorses reside at King Neptune's castle.[3]


Seahorses will eat almost anything.[2]

Mystery is shown eating anemones, an anemone bookmark, Krabby Patties, Old Man Jenkins (she spits him out eventually), part of the grill, part of SpongeBob's spatula, Mr. Krabs' money, and SpongeBob's Krusty Krab hat.[2]



Dunces and Dragons (VE)

Characters:Sir SpongeBobSir PatrickMedieval Moments horn playersMedieval Moments guardsMedieval Moments announcerMorrieMorrie's wifeSeahorsesKnightsDungeon MasterSquidly TentaclesDragon jellyfishKing KrabsPrincess PearlLeechExecutionersPlanktonamorBlacksmithKaren the Crystal BallDark KnightPlanktonamor's guards

Locations:Bikini BottomshireMedieval MomentsPlanktonamor's tower

Songs:The King is BadI Was the King's Favorite FoolSpare Us, Dark KnightThe Dragon is HereThe Princess ScreamsThere Once Was a Dragon

Miscellaneous: DVDVHSOnline gameBookGood Knight SpongeBob

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