Pearl is getting ready for her slumber party, but Mr. Krabs' meddling in the party preparations is getting out of control. Pearl kicks him out of the house, so Mr. Krabs decides to stay at SpongeBob's house. There, SpongeBob puts on a movie that shows girls having a slumber party and inviting their gangster (and seemingly zombie) boyfriends, who begin vandalizing the house. Mr. Krabs is horrified by this and as result, he destroys SpongeBob's television with a bat. He then explains to SpongeBob his concern that this will happen to his house and sends SpongeBob to spy on Pearl and her friends.
Meanwhile, a sponge named Girly TeenGirl from Farawayville that looks like SpongeBob arrives at Mr. Krabs and Pearl's house, asking to get in. However, Pearl thinks she is SpongeBob and she and her friends attack the girl, who runs home crying. At the time, Mr. Krabs and SpongeBob pretend to be pizza deliverers while SpongeBob calls Girly TeenGirl ugly. Unfortunately, SpongeBob is caught during the scuffle and is left behind as Mr. Krabs flees. As a result, he had been turned into pizza by the girls and sent back to Mr. Krabs, telling him that he failed the plan.
SpongeBob later sneaks back in as a piano repairman, but Pearl and her friends already know his tricks and dropped a piano on him. He leaves and tried to tell Mr. Krabs to not spy on her again, but Mr. Krabs said that if he doesn't go to Pearl's party, then he is fired. Upset, SpongeBob goes back to Mr. Krabs' house and begs Pearl to stay at her party. Pearl is convinced, but he falls down into Krabs' root beer cellar while trying to prove in ten seconds that he is fun enough for the party.
SpongeBob absorbs all of Mr. Krabs' root beer to prove that he can be fun, while in hindsight ruining Mr. Krabs' house and putting Pearl and her friends in peril. Mr. Krabs arrives at his destroyed house, and he blames Pearl for its destruction. Enraged with Mr. Krabs sending SpongeBob to spy on her and her friends (who are in shock from the incident) and ruining the party, Pearl takes his money, using it to host her own private beach party at Goo Lagoon, where Mr. Krabs and SpongeBob are the only ones not allowed in. The episode ends with SpongeBob offering a cup of root beer to Mr. Krabs to cheer him up, which does not help.
The scene featuring "Girly TeenGirl" is a reference to a similar scene in "No Weenies Allowed" where it features a drifter who looks like SpongeBob.
Pearl and her friends watch the Slumber Party Zombie Attack movie which is the same movie SpongeBob and Mr. Krabs were watching earlier in the episode. It's possible they were watching it on the same channel.
This episode marks the first and only time that Mr. Krabs is shown in his sleeveless shirt and underwear.
This is the first episode to feature Pearl as a main character since "Best Frenemies."
This is the second time that a sponge that is not related to SpongeBob appears. The first is in "No Weenies Allowed."
This is the second time that someone is allergic to newsprint, the first being Squidward in "Can You Spare a Dime?" A possibility is that the person may have an allergic reaction to the items that were used to make the ink for the paper.
This is Tom King's last episode as a writer and a storyboard director.
Zombie Shock Syndrome is a parody of Shock Syndrome, a potentially fatal bacterial infection.
Mr. Krabs rule of "No eating after midnight" is a reference to the movie "Gremlins."
Mr. Krabs says "You should have been here in thirty minutes or less," a reference to Domino's Pizza's and other pizza chain's famous policy of making the pizza free if it takes more than thirty minutes to deliver.
It is never explained why Girly Teengirl was at the slumber party. At first, Pearl believes she is SpongeBob.
When Pearl is looking at her watch, the watch switches to her other arm.