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"Jeffy's Home Alone!" (also known as Home Alone 3) is the 325th episode of SML Movies.
Mario sits down and Jeffy shows up with a robot voice changer and annoys him. Mario takes the voice changer away from Jeffy and takes Jeffy to bed because it was bedtime. Jeffy says he doesn't want to. Mario checks on Jeffy, but he is in his bunny suit listening to hop hop. Mario tells him to stop but Jeffy shoots Mario with a Nerf gun and Mario gets mad.
Jeffy says that he wishes Mario would just disappear. Mario goes back to the couch and gets a call from his Grandpa saying he needed help from Mario to fix his TV. Mario tells him to turn it on, but his Grandpa says it doesn't work. Mario is pretty sure that it is just a microwave but his Grandpa doesn't listen so Mario goes to help him and leaves Jeffy all alone. Jeffy is now home alone and puts his pee pee in a pile Cheerios and then fills the bathtub with thousands of cheerios.
Jeffy also draws pictures of everyone with boobies (including Mario.). Then he orders a pizza from Brooklyn T. Guy. Brooklyn T. Guy and Simmons go to deliver it on their way to drop off cash to their boss. Brooklyn T. Guy gives Jeffy the pizza box but Jeffy gets money inside the pizza box instead of the actual pizza. Jeffy also doesn't give the Brooklyn T. Guy a tip. Then, Brooklyn T. Guy notices that he gave Jeffy the wrong pizza box so he tries to get it back but Jeffy doesn't let him.
Jeffy goes back to sleep and Drawing Jeffy randomly comes back to life. Brooklyn T. Guy and Simmons decide to try stealing the pizza box back from Jeffy. However, the door was locked so they check under the mat and they find the key to unlock the door. They then begin searching for the money all over the kitchen but they can't find it so they call their boss who turns out to be the Loan Dolphin. The Loan Dolphin gets really mad that they lost his money and tells them that they better get it back.
They continue searching until they come across some bowling pins. Drawing Jeffy suddenly appears with a bowling ball and hits Simmons right in the head, killing him. Brooklyn T. Guy gets really mad, questions Drawing Jeffy about the money and then kidnaps him and leaves. Mario arrives back home where he sees Simmons' dead body. Mario wakes Jeffy up and gets mad at him since he thinks Jeffy had something to do with the dead body.
Mario then gets a call from the Loan Dolphin who says that he has Mario's kid, but it's actually just Drawing Jeffy. The Loan Dolphin asks him to give the money back or else he'll kill the kid but Mario says he won't. The Loan Dolphin questions this and thinks that he called the wrong number so hangs up. Then Jeffy asks Mario if he's seen the bathtub and the video ends.
- This marks the return of Mario's Grandpa, who hasn't been seen since "The 1UP!".
- This marks the fifth return of Simmons in 2017, who hasn't been seen since "Attack Of The Killer Shrimp!".
- This is the only Home Alone episode that only features 1 trap.
- This is also the first Home Alone episode that only has two robbers.
- This episode is actually quite based on Home Alone 3, where Alex replaces Kevin. Also, in the movie, undercover terrorists hide an important chip in a toy car which is accidentally given to Alex. In the video, the pizza gets mistaken.
- This is the third appearance of Drawing Jeffy, the first being "Drawing Jeffy!". and second being "Jeffy Sneaks Out!".
- This is the second time that Jeffy uses his toy guns, first being "Bowser Junior's Nerf War!".
- The drawing of Drawing Jeffy looks different than in the "Drawing Jeffy!" episode.
- This is the fifth episode of 2017 to use the filled bathtub gag. The others are being "Bowser Junior's Curse!", "The Magical Button!", "Chef Pee Pee The Robot" and "Black Yoshi's Mistake!".
- When Simmons gets crushed by the bowling ball it's also a flashback look from when Ringo got crushed by a bowling ball in Home Alone.
- This episode marks the return of Jeffy pooping his pants, which hadn't happened since Jeffy Loses His Pencil!. It is possible that he pooped in the litter box from the time after Jeffy Loses His Pencil until this video.
- This is the first appearance of Drawing Jeffy since Jeffy Sneaks Out!.
- When Jeffy was playing with the voice changer while ordering a pizza he says ''I am your father'' which is a reference to Star Wars: Episode V - The Empire Strikes Back.
- This is the first time Jeffy stares at the viewer. The second time is Jeffy And The Beanstalk!.
- The video follows with the real life Home Alone 3's character change, with the first two movies having Kevin (Bowser Junior) get switched with Alex (Jeffy).
- It is unknown how Drawing Jeffy came to life by himself. He usually comes to life when Jeffy says Doodle Doodle Pencil/Play-Doh Fart.
- It is unknown why Brooklyn T. Guy is wearing the shirt Bowser Junior gave to Bowser in Happy Merry Christmas!.