Mystery is a seahorse that SpongeBob adopted in the episode "My Pretty Seahorse." She also appears in the online game What's Your Bikini Bottom Pet? and the episode "Gary & Spot."



Mystery is a normal light green seahorse. She is bigger than an average seahorse, which are nearly Plankton's size. She has a swirl which contains a tail.


She has similar mannerisms to a regular horse.


"My Pretty Seahorse"

When SpongeBob first finds her, he wanted to have her as a pet. SpongeBob considered naming her Grace, Majesty, or maybe even Debbie, but finally decided upon the name Mystery. SpongeBob tames her and then become friends, and they do many things together.

In the Krusty Krab, she eats flowers, Krabby Patties, Old Man Jenkins, SpongeBob's spatula, the stove, SpongeBob's work hat, and Mr. Krabs' money.

Mr. Krabs doesn't like Mystery and wants SpongeBob to let her go. The latter 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 SpongeBob finally agrees with him.

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

What's Your Bikini Bottom Pet?

She is one of the pets featured on the title screen in this online game.

"Gary & Spot"

Sleepy Time 052
"I can turn into a skyscraper!"
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Mystery staring at SpongeBob's flower bookmark

  • Seahorses similar in appearance to Mystery are seen in the episodes "Whale of a Birthday" and "Breath of Fresh Squidward."
  • She appears to have the ability to cause nuclear explosions. Squidward falls off a cliff and explodes after she runs through him. She also kicks Scooter to the background and he explodes.
  • SpongeBob regretted not naming Mystery "Debbie."
  • Mystery appears on the water ride "Splash Bash" at Nickelodeon Land in Blackpool Pleasure Beach.
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