For the 2021 remake, see Jeffy! (video).
Mario is having a good time until he gets a knock at the door!
The episode starts with Bowser dangling Rosalina over a Piranha Plant. Mario then appears, wearing a Superman costume and also having long, luscious black hair (shampooed and conditioned). Bowser then sees Mario having hair, and is greatly alarmed by it, knowing it is his one true weakness.
Bowser is surprised with Mario's ability to fly, and Mario's gorgeous hair causes Bowser to flee terrified, but not before tossing Rosalina high into the air. Mario catches Rosalina, who thanks Mario for saving her, but Mario crashes into a wall, revealing that it was just a dream. Mario’s dream popped out. There is then a knock at the door. Mario answers the door to a kid with a blue helmet who shows Mario his pencil. The kid reveals his name to be Jeffy, and that it says it on his shirt.
Mario then finds a sticky note on Jeffy's shoulder that says, "Please babysit. -Sorry". Jeffy reveals that his mom dropped him off, and then tries to put the pencil in his nose. Mario stops Jeffy, telling him not to put the pencil in his nose. Jeffy then asks why, and Mario replies with, "Because you're gonna hurt yourself! Don't do that!" Jeffy then starts crying and thinks he is a bad boy, and starts slamming his head against the doorway. Mario calms Jeffy down and tells him to leave. Then Jeffy starts drawing on the doorway with his pencil, but Mario stops him. Mario then lets Jeffy into the apartment. Mario gets Jeffy Scooby-Doo gummies, and tries feeding him "like a giraffe". Mario then asks why Jeffy is wearing a diaper on the outside of his pants... "so they won't get dirty," he says.
The diaper is supposed to be in the inside of his pants, but his reply? "So my diaper don't get dirty." When Mario gets the gummies, Jeffy tries to put a pencil in his nose, then Mario stops him again. Mario calls Rosalina, but finds out that Jeffy actually put his pencil in his nose as well as putting the gummies in his ears. There is a knock on the door, and Rosalina comes in. She brings him a coloring book with crayons. When they come back to the couch, Jeffy disappears - and he is loose in the house!
Then they look for Jeffy until Rosalina finds him in the bathroom. Mario goes to the bathroom and sees Jeffy having pooped his pants and wrapped in toilet paper, while thinking he is a mummy. Mario then got Jeffy's pants cleaned up and lets Jeffy finish his Scooby-Doo gummies, but Jeffy starts patting his diaper. Mario tells Jeffy to stop, but Jeffy won't answer him. Rosalina then comes in the living room and tells Mario that the cops are on their way. Mario and Rosalina then distract Jeffy by giving him a coloring book. Jeffy tries putting a crayon in his nose, but Mario having had enough prevents that from happening, then calls Jeffy a bad boy. Jeffy starts to cry and bang his head against the couch, then Mario and Rosalina stop him from doing that.
When the cop arrives, a distressed Mario shows Jeffy to the cop, but notices he has a crayon in his nose. Mario then tells the cop that Jeffy likes to put stuff in his nose. The cop then asks Jeffy some questions. Jeffy reveals his full name, "Jeffy Jeffy". He then revealed that he lives on the address of the same name.
The cop then asked what house number Jeffy lived in. He said "7", which reveals he is "Jeffy Jeffy" that lives on "7 Jeffy". Jeffy then drops his pencil out of his hand and starts patting his diaper. When Mario says "Bad Jeffy", Jeffy hits his helmet and starts crying and bangs his head on the couch. When Mario and Rosalina say that he is a good boy, he calmed down.
Jeffy then raised his hand in the air, aimed the hand at his diaper and starts spanking it. It was a dream, but in reality, Mario answers the door to Jeffy with the crayon in his nose, showing his pencil to him. Mario then screams in sheer terror, knowing he wasn't really dreaming (the events that played out did happen like they did in the dream), and the episode ends.
- Jeffy (debut)
- Brooklyn T. Guy
- Nancy (indirectly mentioned)
- Bowser (dream only)
- Scooby-Doo (mentioned; on gummies box)
- Toucan Sam (mentioned)
- This episode marks the very first appearance of Jeffy.
- This episode reveals that Jeffy's favorite number was at the time, 7, though he would later come to hate it.
- In the SML Reacts video, it's revealed this was also supposed to be the only appearance of Jeffy. However in "Bowser Junior's Game Night 3", he appeared again, and he is now a main character.
- Jeffy was also the primary antagonist in this episode, while now he is a protagonist.
- This also marks the beginning of the Jeffy era, the most controversial era of the entire SML franchise, and would last until "The Super Bowl Problem!".
- Many fans complained by saying "Jeffy is offensive". Later, Logan stated that Jeffy is supposed to be stupid like Chef Poo Poo, not autistic.
- This is the first time someone had to babysit Jeffy, the others were "Shrek The Babysitter!", "Chef Pee Pee The Babysitter!" and later "Officer Jeffy!".
- This is the first video since "Bowser Junior's Caprisun" to have a bloopers video on SuperLuigiLogan.
- In the Bloopers video, it is revealed that the pencil Jeffy has in his nose is a snapped pencil and the cast used the end of it to stick up Jeffy's nose.
- A square version of the thumbnail can be seen on Logan's Instagram.
- This is the last time that Bowser plays an antagonistic role in this video before Goodman replaced him.
- This is the first video that gets remade on the new SML channel.
- This is also the second overall video to be remade.
- It has been pointed out that this video's plot is similar to the SpongeBob SquarePants episode Stanley S. SquarePants. The major differences are that Stanley leaves and Jeffy stays and also Stanley is a relative to SpongeBob while Jeffy was not related to Mario.
- In this video, Jeffy correctly pronounces the word "giraffe", despite in recent videos, he pronounces it as "gi-da-raffe", most namely "Jeffy's Homework!". This also occurred in Black Yoshi's House Arrest.
- If listened closely at 5:21, someone can be heard wheezing.
- At the beginning of the video, Jeffy ruins Mario's dream. However, Mario wakes up before the knock happens.
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