Luke transforms himself into a secret agent in order to discover who vandalized the Brock with graffiti. His investigation uncovers an apparent conspiracy that includes Dad, Doop and Summer. It all culminates at a secret fundraising event at the Brock, but will Luke's spy gadgets and snappy suit be enough to uncover their shocking secret plan?
Larry meets a cute girl, only to learn that she is Darnell's sister, Mina. Darnell warns Larry to not fall for his sister, because he worries it would mean less time for him and Larry to hang out. Larry tries to keep Mina at bay, but Mina is determined to win Larry over, putting Larry and Darnell's friendship at risk.
Larry finally agrees to spend a day with Mina, but he's worried that if he spends time with Mina that Darnell will feel left out. Taking Lori's advice, Larry tries to sabotage the day's activities to give the impression that he and Mina have nothing in common, but he takes it too far. Meanwhile, Luke and Ronnie plan to spend the entire day playing an epic new board game.
When Mom realizes she's missing out on some of the boys greatest moments, she decides to take a more active role in Luke and Larry's activities. Mom goes overboard and embarrasses Larry at his football games, and Luke at his role-playing group. Rather than ask Mom to tone it down, the boys throw a fake talent show, to trick her into missing their events.
After arguing about who has it tougher, Larry and Luke decide to spend a day in each other's shoes to find out. Larry spends the day live-action role-playing (LARPing) while Luke takes Larry's place on the football team. Larry struggles with the dorkiness of LARPing, and Luke discovers that football is way more bone-crunchingly difficult than he could ever have imagined.
Luke, Dad and Grandpa take a cruise on Grandpa's new yacht. But when Dad sinks the ship, the men are left stranded on a life raft. Things go from bad to worse when they find themselves attacked by sharks. With a sinking raft and no way to navigate, they must rely on their wits and teamwork, both of which are in short supply.
Mom and Dad are throwing Lori a surprise birthday party, but the plan goes awry when Mom forgets to mail out the party invitations. While Mom scrambles to get a last-minute party together, everyone tries to make Lori feel better by telling tales of their own worst birthdays.
Larry and Luke find out that Doop has two tickets to a sold-out monster truck rally. The boys start buttering up Doop, each one hoping to get the ticket. But when Summer catches on to their plan, she does her best to foil it. Meanwhile, Lori freaks out Mom by befriending Razor, her school's resident bad boy. Mom and Dad try to steer Lori away from Razor, which only makes Lori like him more.
When the bedbugs from Lori's school experiment escape, the Stanleys and the Dewhursts all have to temporarily move into the Brock. Tensions run high between the parents, while Mina gets jealous of how close Larry and Summer become as roomates. Meanwhile, Lori and Doop race to capture all the bugs and return them safely to their observation tank, before a ruthless exterminator gets them first.
When Luke accidentally knocks over Chaz at a karate demonstration, Chaz challenges Luke to one-on-one karate match. To prepare for the fight, Luke trains with Ronnie, a master of martial arts movie training sequences. Unfortunately, movie fights are a lot different from the real thing, and when the match comes, Luke is woefully unprepared. Meanwhile, Darnell asks Larry to watch his pet bird.
Mina has a big dance audition coming up and recruits her handsome and talented ex-partner, Blake, to help. But when Larry accidentally injures Blake, Mina forces Larry to take his place. Unfortunately, Mina proves to be a drill sergeant of an instructor. Meanwhile, Luke discovers a magic chest in the house, prompting Dad to reveal his secret past as a magician.
Larry brings home a new addition to the family: Hurricane, a cartoon puppy. Everyone instantly falls in love with it, despite the trail of chaos it leaves everywhere it goes. But when Luke realizes he's allergic to the dog, he tries to keep it a secret, worried that his family will have to get rid of it. Meanwhile, Summer finds that her troop of Nature Girls aren't particularly fond of her.
While Mom and Dad take Lori out of town for a spelling bee, Grandpa comes to look after Luke and Larry for the weekend. The boys expect Grandpa to give them spending money, but Grandpa wants to teach them the value of earning a dollar. He helps them set up small businesses, which fail miserably until the boys combine them into one massively successful business.
Famous astronaut Glenn Cooper visits The Brock to judge the youth space fair, and all the kids sign up to compete. In an attempt to discredit the entire space program, Ronnie sets out to stage a fake moon landing using Luke as his astronaut. Luke is excited, unaware that he's not actually going into space, but when Lori tinkers with Ronnie's rocket, Luke just might end up blasting off.
Luke sets out to direct the annual Brockdale community theatre play. But when he casts Larry as his lead, Luke finds himself being muscled out of his own production, as Larry has a lot of ideas of his own to make the play better. Meanwhile, when Mom's catering job at the Brock is made obsolete, Pam gives her a new position as Summer's assistant in the Athletic Department.
Luke and his friends try out for South Ridge's exclusive and snobby cheer team. But after being roundly rejected, they create their own rival squad. Luke captures the attention of head cheerleader, Courtney, who offers him a spot on the real squad. Meanwhile, Dad is excited when he's asked to do a book signing but it doesn't go well.
Pam is offered a job in Hawaii, but will only leave if she can find a suitable replacement manager for the Brock. Pam finds her dream replacement, but Larry and Luke worry the new manager will mean changes at the Brock, and they hate change. Meanwhile, Mom and Dad ground Lori and are determined to make it stick, despite Lori's best efforts to get out of the house.
Susan, the Brock's new manager, rejects Larry and Lori's membership. They team up with Summer to prove that Susan is keeping kids out of the Brock. But when Larry goes undercover as an adult, he gets seduced by the fancy new Brock, and it's up to Lori and Summer to pull him out. Meanwhile, Dad buys a fancy new smart-home system, which quickly outsmarts him, Luke and Doop.
Larry lies to Summer, telling her he plays in a famous rock band. When Pam books Larry's band to perform at a concert at the Brock, Larry assembles a fake band, together with Darnell and Ronnie. There's only one problem: they sound terrible. Lori helps Larry with an app that turns their garbage music into hit tunes, but even technology can't turn Larry into a real rock star.
The football team is having a Hawaiian luau-themed dance. Mina assumes Larry will take her, but Darnell assumes he and Larry will make the dance a bro night Larry is caught in a growing web of lies as he tries to juggle his dates. Meanwhile, Mom volunteers to make dessert for the dance, but when Luke requests a giant, volcano-shaped baked Alaska, Mom is out of her depth.
The LARP-ing King's Crown is up for grabs after the reigning king, Dennis, is banned from the Brock. Dennis befriends Luke, but Ronnie is suspicious that Dennis is only using Luke to get to the crown. Meanwhile, to help Larry study for his upcoming history exam, the family pitches in by recreating ancient Rome in the house, complete with Roman feasts, baths, and gladiator matches.
Luke accidentally drinks Morgan's plant growth serum, and the side effects turn him into a petulant teenager. Seeing an opportunity to become the "good son" in his parents' eyes, Larry brews a modified version of the serum, which accidentally turns Luke into a monster. Meanwhile, Dad is mistaken for a substitute teacher at the high school, and manages to impress Principal Webber.
A representative from the BerryBlast juice company discovers Luke and hires him to be their new cartoon mascot. Meanwhile, Larry has to do a book report, but doesn't want to read the book. When he finds out Morgan's all-women's book club is discussing the book, he disguises himself as a woman to learn about it without having to read it.
Principal Webber appoints Luke as the new hall monitor, but the power quickly goes to Luke's head. Soon, Luke is handing out detentions for even the smallest infractions, and no one is safe, not even Principal Webber. Larry must lead his ragtag team of fellow detentionees to freedom, but their only hope is to bust Luke for breaking one of his own rules.
The Stanley kids are excited when Dad's rugged cowboy brother, Hank, stays with them while competing at the local Rodeo Games. But when Larry volunteers to be Hank's partner, Mom and Dad are reluctant. Larry assumes it's because cowboy life can be dangerous, but soon discovers it's because Uncle Hank is actually a rodeo clown and Larry's now been roped into the humiliating job.
While giving out candy on Halloween, Luke challenges trick-or-treaters to sit through three spooky stories without running away in terror. In one story, a mishap with Morgan's duplicator machine results in Larry transforming into a spider. In another, the family is visited by a pleasant spirit who takes over Dad's body.