It's lunchtime at school, and Lincoln and Clyde are excited, up to the point where even Clyde's palms are sweating, as his sandwich, fork, and milk all slip from his hands, and land on him. Lincoln explains that his classmate, Chandler, is giving invitations to his birthday. Lincoln says it is at a sewage plant where his father works there and he says it's going to be epic. Clyde says that it processes 500 tons of human waste a day, Lincoln says there a secret room for mutant animals they find, Clyde points out that if you're exposed to the waste, their nose hairs will burn due to the stench. Lincoln is still excited before the lights turned off and two kids (the same ones from "Save the Date") have invitations and students were gathered up. Chandler arrives and uses a plunger to give invites to most of his classmates.
He has two invites left and the duo was really excited, as Chandler is about to give the invites away, only to two other kids, much to Lincoln and Clyde's dismay. At an arcade named "Gus' Games and Grub", Lincoln (at an arcade machine) and Clyde (who is at a dancing machine) express their anger at Chandler for not inviting them. Lori, in her work uniform, greets her brother and Clyde who, once again, faints (and nosebleeds) upon seeing her. Lori walks up to Lincoln and thanks him for referring this job to her. Much to her joy, she has finally earned enough money to buy her a new dress for her school dance. She says the theme is "Romance Under the Sea", and she and Bobby are the King and Queen. Lori's boss makes her return to work and she leaves, though not before giving Lincoln free tokens, much to his glee. Clyde regains consciousness and Lincoln tells him about the tokens and Clyde faints again.
Later, the two are still playing video games, and Clyde saves his tickets to buy Lori a pig bobbled head. Lincoln asks if he's okay with Lori working here, but Clyde doesn't care. Lori gives pizza and root beer to the duo, as a way to say thanks to Lincoln for giving her this job. Chandler arrives, and upon seeing Lincoln got free pizza, due to Lori working here, he wants it, and Lincoln takes Clyde's slice, much to his chagrin. Lincoln explains that if he gives free stuff to Chandler, he will probably invite them to his party, which Clyde agrees to. The next day, Chandler shows up, and requests more and more favors for himself and his friends from Lincoln and Clyde, which they make Lori help them fulfill, much to her distress, as it keeps getting her in hot water with her boss. After doing many favors, they finally get their invitations, much to their delight.
Later that night, Lincoln (wearing a tuxedo) is getting ready for Chandler's party. He sees a sad Lori, who is in her work uniform walking down the stairs as she reveals that her boss is forcing her to work overtime, because of all the free stuff she gave to Lincoln to give to Chandler, and that she's gonna miss the dance. Feeling sorry for his eldest sister, Lincoln decides to cover for her, and not go to Chandler's party. While doing so, Lori comes in wearing her dance dress, and thanks Lincoln for covering for her. She consoles Lincoln for not going to Chandler's party, but Lincoln says Chandler was never friends with him; he was using Lincoln, just like Lincoln was using Lori earlier. He tells her to have a good time and the two hug each other before Bobby, by accident, crashes his car upon arrival, much to Lincoln and Lori's concern and happiness, respectively.
Later at the restaurant, Lincoln is still working at the counter, when Clyde arrives, revealing that he didn't go to Chandler's party because he wouldn't want to go somewhere without his best friend. Lincoln laments that they never got exposed to raw sewage. The boss tells Lincoln to grab a mop and clean a toilet filled with sewage, and much to the boys' sheer excitement, they get exposed to the sewage.