"Bowser Junior's New Room!" is the 450th of SML Movies.
Bowser brings his son and Chef Pee Pee to the kitchen, telling him not to eat the last donut that he has. When Bowser leaves, Chef Pee Pee tempts Junior into eating the donut. Junior does and Bowser finds out. Junior accidentally confesses to his father for what he did. He punishes Junior for his actions as he explains to him that stealing from others is wrong and that bad actions have consequences and sends him to his room while also revoking his toy and phone privileges.
Joseph then arrives and asks Junior to go out and ding-dong ditching with him. But it was just a scheme set up by Bowser to get Junior into trouble further and to presumably teach Junior a lesson for what he did earlier. Afterwards, Bowser kicks Junior out of his room to have him sleep with Chef Pee Pee.
After a few minutes of sleeping with Junior, Chef Pee Pee went to Bowser to complain. Bowser told Chef Pee Pee that he'll make him a bed and Chef Pee Pee is really happy.
Eventually, Bowser made a bunk bed for both Chef Pee Pee and Junior. And the video ends with Junior further irritating Chef Pee Pee before finally going to bed.
- It is revealed that Joseph usually stalks Junior every night when he's sleeping. This may imply Joseph is Gay or Bisexual. However, this could simply be a lie after Bowser made the deal with him.
- This is one of the few videos where Bowser schemes his own son.
- This video was uploaded on movie actor singer Maggie Lindemann's birthday.
- This is the first video since Chef Pee Pee Pees Peas to not have a scene in the Game Room.
- This is the final video of Bowser Junior's Thomas room.
- This is the first 2019 video Chris doesn't voice act in.
- The thumbnail is misleading as it hints that Junior's new room will be Thomas-themed but in the actual episode, the playroom becomes the new bedroom.
- This video doesn't have a synopsis.
- Junior mentions that Bowser took away his phone and his toys, however, Bowser is only seen taking away Junior's phone and not his toys.
- However, it is possible that Bowser took Junior's toys away off-screen.