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|First appearance:||"Opposite Day"|
|Latest appearance:||"Company Picnic"|
|List of species|
Hippocampus, more commonly known as Seahorse, is the genus of Mystery.
Green version of seahorse appeared only in episode "My Pretty Seahorse ". Her role in episode was SpongeBob temporarily pet.
Gray version of seahorse appeared only once, in the episode "Nasty Patty ." It didn't have any special role, he or she only appeared as a photo on a horseradish container.
Seahorses will eat almost anything.
Mystery was shown eating, anemones, an anemone bookmark, Krabby Patties, Old Man Jenkins (she spit him out), part of the grill, part of SpongeBob's spatula, Mr. Krabs' money, and SpongeBob's Krusty Krab hat.
- It was mentioned in the episode "Bubble Buddy."
- A seahorse was put in "Opposite Day" as part of the pin-the-tail-on-the-seahorse party activity.