"Jeffy's Backpack!" is the 452nd episode of SML Movies.
This video starts out with Bowser Junior and his friends on the couch. Joseph and Junior were complaining about school. Cody said he likes it which triggered Junior so Junior decided to beat him up. Cody then shows off his hello kitty backpack. Junior said it’s cool but his “Poliwhirl” backpack which just turns out to be a Pokémon backpack with a Poliwhirl sticker taped on it, is cooler. Junior and Cody ask where Joseph’s backpack is and Joseph claims that his backpack is “expensive” Which just turns out to be a paper bag with the text “bak pak” on it. Cody finds it suspicious and Junior soon went to Chef Pee Pee for lunch. Chef Pee Pee told Junior that he packed the food in the lunchbox he created which is a merch plug in the SML merch store (https://smlmerch.com/). Chef Pee Pee claims it even has his own catchphrase “Everyday is Taco Tuesday” and Junior claims that he said this all the time. Junior thought that was cool and ask if there is a taco in it. Chef Pee Pee says that he ran out of tacos so he just pack a dragonfruit, mayo, ketchup, cheese, egg and garlic presumably much to Junior's dismay. Junior brings the lunchbox and shows it to his friend and told him about the catchphrase. Cody said that he never heard Chef Pee Pee saying the catchphrase. Chef pee pee then comes in and says this catchphrase over and over Which triggered Cody.
First Day Of School
During the first day of school. Jackie Chu says that this year will be a tough and difficult year for the students considering that the subjects this year are going to be much more difficult that last year. He also says that there is going to be more homework. Junior and Jeffy both disliked it but Cody really liked it. Junior ask Jeffy why he doesn’t have a bookbag and he said he doesn’t need it. Junior ask how he will be able to carry the papers and supplies and Jeffy said he could shove it in random places of his body. Jackie Chu yelled at him for not having his bookbag and told him good luck carrying all the paper and Bully Bill later started to make fun of Jeffy. Jeffy continuously tells Bully Bill that he doesn’t need it but Bully Bill think it’s a excuse considering he thinks he poor. Jeffy went home disappointed and told Mario what happened. Mario asks Jeffy to put all the stuff in his diaper but Jeffy refused as Bully Bill will make fun of him once again and Mario soon started to buy a Minecraft backpack for Jeffy.
Second Day of School
The next day, Jeffy arrives at school with his new Minecraft backpack. As Jackie Chu prepares the class more homework, Bully Bill still made fun of Jeffy. So to retaliate, Jeffy got out a toy enchanted sword and started hitting Bully Bill with it. In the end, Jeffy got in trouble and Brooklyn Guy tells Mario what happened. Mario then tells Jeffy to promise not to bring any toys to school and not to hit anyone with them. Jeffy started thinking for three hours before he came to the conclusion that he doesn't like his Minecraft backpack anymore. So Mario brought him a Jeffy-themed backpack, which he was originally going to save until Christmas.
Third Day of School
On the third day, Jackie Chu gives the class more homework and announces that he's going to keep on double the class' homework for the rest of the year. Jeffy enters the classroom wearing his new backpack. Jackie Chu demands Jeffy to take it off his head, but Jeffy replies with a muffled 'I didn't have to.' And surprisingly, Jackie Chu buys Jeffy's answer and returns to teaching. Chef Pee Pee then barges into the room and announces that 'Everyday is Taco Tuesday!' But Cody shoos him away. Bully Bill kept on making fun of Jeffy, so a laser mechanism in the backpack starts to activate, but Bully Bill protects himself by hiding behind his backpack. Brooklyn Guy returns telling him what happened to Jeffy and his backpack at school. Luckily, Bully Bill didn't get hurt as his backpack is bulletproof. And Brooklyn Guy can't do anything about Bully Bill pressing charges because he got suspended. Before he leaves though, Brooklyn Guy states that Jeffy's backpack can't shoot lasers anymore. So to prevent that from happening, Mario makes Jeffy to promise himself not to get bullied anymore before breaking the fourth wall by announcing to everyone to go to smlmerch.com to get their own Jeffy backpack.
- This video was supposed to be like an advertisement for back-to-school supplies.
- This video realistically should've been uploaded on September like most schools in the northern hemisphere do.
- This is the first episode in the Fourth the Grade series.
- This video shows that Junior and Cody both seem to like Hello Kitty, Joseph however seems to hate Hello Kitty as he says "Ew" when Cody shows it if listened closely.
- This is the first video to have an outro.
- In Jeffy's Lunch Money!, Jeffy states that he needs $5 per day for lunch at school, however, Jeffy states that he wiped his butt with $30 worth of lunch meaning that he needed $6 per day for lunch. Although the school could have just increased the price of lunch by $1 since then.
- Much like Bowser Junior's New Room!, the video does not have a synopsis.