- French Narrator
- Patrick Star
- SpongeBob SquarePants
- Squidward Tentacles
- Mystery the Seahorse (debut)
- Eugene H. Krabs
- Ghosts (mentioned)
- Victor Krabs (indirectly mentioned as "father")
In the beginning of the episode, it is springtime in Bikini Bottom, and the three neighbors are celebrating accordingly. SpongeBob, however, is having a problem in which each flower he plants suddenly gets eaten every time he looks away, but never when he has his eyes on it. SpongeBob then discovers that the culprit is a green seahorse. The seahorse is lured towards his floral bookmark, which she eats. They become friends and begin to ride around and do things together. At the end of the day, SpongeBob decides to keep Mystery as his new pet, and lets her stay at his house.
When SpongeBob arrives at work the next morning, he leaves Mystery outside at the bike post. Scooter and Wobbles approach Mystery and mistake her for a kiddy ride. Wobbles suggest Scooter try it out, and when he inserts a coin into her "slot," Mystery kicks him into the distance and he blows upon impact. Wobbles run away screaming, causing Mr. Krabs to come out and see what the trouble is. He sees Mystery and mistakes her for a monster; SpongeBob tells him that she is his pet, but due to her injuring a prospective customer, he is ordered to get rid of her, and if he disregards his order, he will be fired for not cooperating with him.
SpongeBob attempts to hide her in a cupboard in the kitchen while Patrick finishes building a stable. SpongeBob offers Mystery a Krabby Patty, which she begins craving after eating. While he initially avoids being caught sneaking Mystery into the kitchen, SpongeBob gets in trouble when Mr. Krabs comes out of his office a second time and witnesses him curing a sick Mystery, who had developed a stomachache from consuming various objects moments prior. Mr. Krabs is upset with his employee, and he tells SpongeBob that the horse has got to go, but SpongeBob is extremely reluctant to proceed due to great sentiment.
Mr. Krabs, feeling sympathy for SpongeBob, tells him a story of his favorite dollar and how he eventually spent it for a soda on a hot day. He tells SpongeBob that Mystery needs to be freed because the indoors are not a place for a wild animal, and SpongeBob consents and takes Mystery out the front door, where he painfully asks her to leave. Mr. Krabs tries to comfort SpongeBob until Squidward shows him an empty safe. Realizing that Mystery ate the Krusty Krab's finances, SpongeBob and Mr. Krabs chase after her, disappearing into the distance. The episode ends with Patrick trying to enter a hat store, but is unable to because the wooden plank nailed to his head is too wide to fit through the door.
- The onions making people cry.
- Nuclear explosions occurring whenever someone lands on the ground.
- Patrick shown with a nailed wooden plank on his head.
|( ‣ ) Production music|
|( • ) Original music|
|( ◦ ) SpongeBob music|
‣ Popcorn - John Scott [Title card]
‣ Pastime - Gerhard Trede [opening]
• Harp! - Nicolas Carr ["I've got spring fever!"]
‣ Hula Festival - George Elliott [SpongeBob smelling flowers]
• ? Vibes - Nicolas Carr [Flower gets eaten/Flower gets eaten again]
‣ On The Beach - Kapono Beamer [three days later]
‣ Dramatic Cue (D) - Ronald Hanmer [dramatic sting]
‣ Magical Effect (e) - Paddy Kingsland [SpongeBob sees seahorse]
‣ The Way West - Jack Dorsey ["She's beautiful!"]
‣ Stepping into Danger - Mike Sunderland [seahorse eating flowers]
‣ Youthful Days - Mike Sunderland [SpongeBob writes in his diary]
‣ Stepping into Danger - Mike Sunderland [seahorse coming toward SpongeBob]
‣ Braden Beat - Alan Moorhouse [montage of SpongeBob and Mystery together]
‣ Best of the West - Gregor F. Narholz [SpongeBob riding Mystery to work]
‣ The Homeward Trail (b) [#38] - John Fox [SpongeBob tells Mystery to wait outside]
‣ Death Trap - Gregor F. Narholz ["Help! Kiddy ride on the loose!"]
‣ Hawaiian Link (B) - Richard Myhill ["It's either you or Mystery."]
‣ Botany Bay (b) - Robert Alexander White [SpongeBob sad]
• Harp! - Nicolas Carr ["Ha! It worked, girl!"]
‣ Stepping into Danger - Mike Sunderland ["SpongeBob, what was that?"]
• Idea Vibe - Nicolas Carr ["Huh?"]
‣ Dramatic Cue (E) - Ronald Hanmer [SpongeBob worries that the Krusty Krab is haunted]
‣ Comic Walk - Sidney Torch [Mystery eating Krabby Patties]
‣ Danger Zone - Mike Sunderland [Mystery ate everything]
‣ Dramatic Impact (2) - Ivor Slaney ["David H. Jones!"]
‣ Fates [#62] - Gregor F. Narholz ["Please don't make me give up Mystery!"]
‣ Tympup A - Sammy Burdson, John Charles Fiddy [bowl of onions]
‣ Blow The Man Down (D) - Robert Alexander White ["Your story has touched me heart."]
‣ Blow The Man Down (C) - Robert Alexander White ["And one day at the beach, it was so hot and I was so thirsty! I spent it on a soda!"]
‣ My Horse and I - Norman John Warren [SpongeBob lets Mystery go]
• SpongeBob Theme - Sage Guyton, Jeremy Wakefield ["Get that horse!"]
‣ My Horse and I - Norman John Warren [ending]
- This episode is available on the Halloween, Complete 3rd Season, The Seahorse, SpongeBob ScaryPants Collection, Sponge in Service, The Ultimate SpongeBob Box Set, The SpongeBob SquarePants Collection, The SpongeBob SquarePants 8 Season DVD Collection, SpongeGuard on Duty (Russian), Orange Collection, 2-Season TV Pack, From the Beginning, Part 1, SpongeBob SquarePants Vol. 4, First 100 Episodes, Holidays with SpongeBob 3-DVD Gift Set, Complete Third Season, The Third & Fourth Seasons, and The Best 200 Episodes Ever DVDs.
- "My Pretty Seahorse" was ranked #91 during the Best Day Ever event from November 9–10, 2006.
- "My Pretty Seahorse" was ranked #42 during the SpongeBob's Top 100 event in the UK and Ireland from June 4-8, 2012.
- This is the first episode that Kent Osborne worked on.
- This is the second episode in which SpongeBob lets a wild animal stay at his house, after "Jellyfish Jam."
- Squidward's line "I order the food, you cook the food. We do that for forty years, and then we die." was included in the Time article Soaking Up Attention on December 9, 2001, seven months before the episode aired, though likely after the episode was finished.
- A shot of SpongeBob riding Mystery from this episode can be seen in SpongeBob's bathroom in Battle for Bikini Bottom - Rehydrated.
- Just like in "Jellyfishing," Squidward rides on his bike, trips on something, falls off a cliff, explodes, and moans faintly after exploding.
- In the Dutch dub, this episode is called "Mystery," obviously inspired by the seahorse's name.
- A clip from this episode was used during Nicktoons bumpers in 2017.
- SpongeBob contemplates naming the horse Grace, Majesty, or Debbie before deciding upon the name Mystery.
- In the French dub, he ultimately did name her Debbie.
- Also the French dub translates the episode to "The Hippocampus."
- In the French dub, he ultimately did name her Debbie.
- Mystery eats all the Krabby Patties, SpongeBob's work hat, his spatula, the stove, Old Man Jenkins, and much of the money in the Krusty Krab's safe.
- This is the 100th episode segment of the series in airing order.
- During airings on TurboNick, SpongeBob and Mystery dancing is accompanied by a song from the Nickelodeon sitcom The Naked Brothers Band for unknown reasons.
- This is the second episode where the customers spit out their food after being disgusted while overhearing Mr. Krabs' words to SpongeBob. The first was "Suds," where Mr. Krabs says he does not want SpongeBob sneezing all over his food. In this episode, Mr. Krabs says the kitchen is no place for a live horse.
- For unknown reasons, this episode and its sister episode were rated 13+ on Amazon Prime Video in August 2020.
- This has since been corrected as of October 2020, and the episode is back to being rated its original TV-Y7 rating on Amazon Prime Video.
- During the Best Day Ever marathon, this episode was paired with "Wet Painters."
- Mystery's nickname, "Sir Eats-A-Lot," is a pun on Sir Lancelot, a knight from the tales of King Arthur of Camelot.
- During the montage, Mystery paints SpongeBob à la the 1997 film Titanic.
- This episode’s title might be a reference to the toy My Pretty Pony, the predecessor of My Little Pony.
- In the opening credits, Paul Tibbitt's name is misspelled with the final 'T' removed. This mistake was fixed on the Halloween DVD release.
- In one scene, SpongeBob is shown holding the bag of hypoallergenic flowers, but a few seconds later, the bag disappears.
- Among the things eaten by Mystery is part of SpongeBob's Krusty Krab employee hat, but in a later scene, where he attempts to give Mystery a bicarbonate soda, his whole hat is back.
- In the closing credits to this episode, Frank Welker's first name is mistakenly listed as "Tom."
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