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.
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"
"I can turn into a skyscraper!"
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