| Please note the following:
"Bowser Junior's 9th Birthday!" is the 330th episode of SML Movies.
Bowser Junior is grounded on his birthday! But that won't stop him from throwing a party!
Bowser is finally ready to watch Charleyyy and Friends, but Junior announces that it's his birthday to him, and Bowser didn't even know that it's his birthday, so he tries to say that he remembered and realized that Junior has already had a birthday last year and asks if he did, and Junior replies saying he has one every year and Bowser says he should think about the dying kids in Africa because they never have birthdays, and Junior starts to think he won't have a birthday.
Bowser then tells him to wait until next year and then Charleyyy comes on. Junior complains about the fact that he cares more about the show than him and proceeds to smash the TV with a hammer while yelling foolishly in anger. Bowser eventually becomes furious, snaps and begins yelling at junior as he begins to slam him into the broken TV. He then drags Junior to his room and throws him there. Bowser eventually tells Junior that he's grounded.
Bowser Junior at first thinks that he can't get grounded on his birthday but Bowser talks back saying bad kids don't have birthdays making Junior realize that his father has strict rules about breaking his private property. Even on his birthday. Junior eventually says it doesn't matter because he forgot about his birthday, and Bowser finally tells him that it was a joke since Chef Pee Pee was throwing him a surprise birthday party downstairs.
Junior was dragged downstairs to the party where there's cake and everything and Chef Pee Pee yells 'Happy Birthday' to Junior and balloons are released afterward. But they still can't have it since Junior was still grounded. Bowser then drags Junior away and tells Chef Pee Pee to throw it all away. Chef Pee Pee complains and tells Bowser to know how long it took to get the party ready and throws the cupcakes away in anger. As Bowser drags Junior back to his room and throws him there he tries to apologize to his father about the whole incident but it was too late as Junior proved to his father that he can't behave himself just for one day.
A Mystery person in a costume comes back saying he's decided that he's not grounded and is having the party. Junior asks if he's serious, but it turns out that the person was just Chef Pee Pee who uses the 'Nah it's just me nigga!' joke and runs off laughing. Junior eventually yells in despair that it's his worst birthday ever. Bowser answers the door to Joseph and Cody and tells them that Junior was grounded. Bowser slams the door shut as he walks away still upset about what happened to his flat screen.
The scene cuts to Junior's bedroom where Junior was sitting on his bed in despair until he sees Joseph and Cody knocking on the window. He lets them in, and Joseph and Cody give him presents. Joseph gives him an emoji poop cookie, and Cody gives him a board game: Soggy Doggy. Junior still wants to have a party though. Then they come up with a plan to trick Bowser and Cody and Joseph disguise themselves as Archibald P. Chapman and tell him Charleyyy is at the gas station which makes him rush there. Then Junior tricks Chef Pee Pee to set up the party again, dressed as Bowser.
Then Junior invites all his friends over, and Cody is drunk on root beer and tries to hump Junior, and then he makes Toad, blindfolded, pin a star on his dad to defeat him because he didn't let the party happen and Toad gets a bullseye. Then Cody fires a morphing gun at a Dinosaur balloon to make it come to life and the dinosaur destroys the party table. Then Brooklyn T. Guy shows up as a Police Officer and says he is here to make a disturbance complain, but it's because they weren't making enough noise and then he joins in. But then Bowser comes home and proceeds to go upstairs to check on Junior when he realized that he was out of his room.
Bowser begins to snap when he sees Junior out of his bedroom and was about to punish him harder until he realized that the party sounded like fun. Then they go to the Birthday Cake and Junior makes a wish, which is to overuse a joke and blows out the candle, and Chef Pee Pee pops out of the cake as part of the “Nah, it’s just me nigga” gag, and the video ends.
- Bowser Junior
- Chef Pee Pee
- Brooklyn T. Guy
- Pablo (joke only)
- Chilly (joke only)
- Chef Poo Poo (puppet only)
- Donald Rodriguez (cameo)
- Charleyyy (In TV)
- Sonic (cameo)
- Toadette (cameo)
- Mario (Party banner)
- Luigi (Party banner)
- Donkey Kong (Party banner)
- Yoshi (Party banner)
- Peach (Party banner)
- Bob-omb (Party banner)
- The Bowser puppet from "The Perfect Plan!" is used again, but as a disguise only.
- This video marks the return of the T-Rex from "The Past Machine!"
- This is Toad's first speaking appearance since "Picture Day!"
- The Chef Poo Poo puppet is used again at the end of the video.
- This is the second shortest birthday special, with the first being "Chef Pee Pee's Birthday".
- This is also the first time Cody is seen without glasses in the thumbnail.
- This is Toadette's second appearance in 2017 and the first being "Substitute Teacher!"
- The birthday cake in the thumbnail is reused from "Jeffy's Birthday Wish!".
- This is the 6th time the Charleyyy and Friends theme song/full intro is played.
- When Junior broke the TV, it is similar to how The Cat In The Hat broke the TV in "The Cat In The Hat".
- This is the 3rd video in a row to have Patrick.
- The gun used to turn the dinosaur balloon into the T-Rex is the same gun used to shrink stuff shown in "Picture Day!"
- If the viewer looks closely at Patrick he looks different in this video.
- This is the final video of September 2017.
- When Junior gets his Soggy Doggy Board Game Present Cody says they haven't done a game night all year (hint) meaning that they might do a Game night video soon and Junior says they'll do a game night when their week is lazy.
- The Sonic the Hedgehog from Tito's channel, Titototter, is seen as a cameo between Patrick and Felipe when the party starts at 6:46. After that, he's not seen for the rest of the video.
- This is the second time Cody gets drunk, the first time being in Root Beer!
- In the behind the scenes, Lovell said, "Nah it's me n*gga! Got your a** again! But happy birthday though!!" He said it in a higher, and louder voice, but Logan relaid the audio from Bowser Junior's Doll!.
- When Cody makes the dinosaur balloon come to life, Tito can be seen in the costume when the T-Rex is roaring.
- Pablo and Chilly can be clearly seen holding Toad, Brooklyn T. Guy, Chef Pee Pee and Joseph at 9:36.
- However, when Logan found out about this, he embraced it as a joke to enhance the video. Because it looks like they're at the party too.
- At 5:04 Junior makes a grammatical error when he says “I can’t believe you actually guys did it!” When it should be, “I can’t believe you guys actually did it!”
- When the T-Rex destroys the party, Felipe can be seen lying on the table when he fled with everyone the scene prior.
- At the end when Chef Poo Poo says, "Nah, it's just me, n*gga!", the audio from Bowser Junior's Doll! where Chef Pee Pee closes the door can be heard as soon as he leaves, clearly meaning that the audio from said video is reused.
- When Cody and Joseph were on Junior's roof, Jeffy's crib can be seen in the reflection from the window.
- When Bowser grounded his son for his actions, he did not take away his toys like in Bowser Junior's Doll!. This could be due to the video being non-canon or Bowser might have tried to be a bit easy on Junior when he punished him.
- For some reason before and after the dinosaur comes to life, behind the dinosaur, there is a random toy wheel on the ground behind one of the curtains.