Operation: C.A.T.S./Operation: P.O.P.
Operation: C.A.T.S.: Numbuh Four finds himself entrapped by the frighteningly feline Crazy Old Cat Lady and her army of eleventy-billion cats and the only Kids Next Door operative that can save him isn't even speaking to him!/Operation: P.O.P.: When adults raise the drinking age of root beer up to 13, the Kids Next Door find they have to shake things up for the sinister Mr. Fizz and his minions from the Soda Control Board!
Operation: S.P.A.N.K./Operation: D.A.T.E
Operation: S.P.A.N.K.: When a stint in the slammer helps the dreaded Count Spanklot see the wrong of his hiney-hurting ways, the reformed Sultan of Sting becomes determined to join the Kids Next Door, a prospect that Numbuhs One through Five have trouble getting behind./Operation: D.A.T.E.: Numbuh One invites his oblivious, erstwhile girlfriend, Lizzie, to accompany him to a party hosted by the Delightful Children from Down the Lane as cover for his top-secret reconnaissance. But soon he doesn't know whom to fear most: his arch-enemies or his spurned date.
Operation: S.U.P.P.O.R.T./Operation: T.A.P.I.O.C.A.
Operation: S.U.P.P.O.R.T.: During a visit to her house, Numbuhs One and Two discover Numbuh Five's teenage sister, Cree, wears a training bra. Training for what? Determining B.R.A. stands for Battle Ready Armor, the boys do whatever it takes to discover what's inside these dangerous devices./Operation: T.A.P.I.O.C.A.: A powerful, mysterious gang of teens is trying to flood the town with truckloads of disgusting tapioca and only Numbuh Two's Granny knows why.
Operation: M.O.V.I.E./Operation: F.A.S.T.-F.O.O.D.
Operation: M.O.V.I.E.: A cleverly disguised Numbuh Four attempts to sneak into an R-rated movie only to discover he's not the only one in the audience with a secret to hide./Operation: F.A.S.T.-F.O.O.D.: When Numbuh Three's birthday wish is to lead a mission, the Kids Next Door quickly devise a super-simple mission for her to go on, unwittingly putting her in mortal danger!
Operation: S.H.A.V.E./Operation: O.O.M.P.P.A.H.
Operation: S.H.A.V.E.: It's bad enough that greasy uncles have mustaches, but when Kids Next Door operatives in Texas start growing whiskers south of their schnozes, it's up to Numbuhs One through Five to clip this problem in the bud, and they're not takin' any lip!/Operation: O.O.M.P.-P.A.H.: Numbuh One knew he'd hate the day he'd have to go fishing with his dad. But he never thought he'd find himself battling in the most deadly sousaphone duel of his life!
Operation: F.L.A.V.O.R./Operation: K.I.S.S.
Operation: F.L.A.V.O.R.: Numbuh Five has always dreamed of tasting ice cream's legendary Fourth Flavor (the lost elemental flavor that followed strawberry, vanilla and chocolate). When she suddenly finds herself in possession of the mystical Golden Scoop, will she work with the Delightful Children from Down the Lane to make her dream a reality?/Operation: K.I.S.S.: In a hamster-related experiment gone horribly wrong, Numbuh Two suddenly discovers he has the body of a teenager! This seeming tragedy has an upside when the girl of his dreams becomes smitten with him. But his new girlfriend has a secret terrible enough to destroy the Kids Next Door or break his heart or both!
Operation: G.H.O.S.T./Operation: F.U.G.I.T.I.V.E.
Operation: G.H.O.S.T.: When one of the Treehouse's beloved hamsters passes away, Numbuh Three misses him terribly. Unfortunately, he misses her too, and Chubbo won't be satisfied until Numbuh Three joins him in his new home forever!/Operation: F.U.G.I.T.I.V.E.: When a 13-year-old Kids Next Door operative scheduled for decommissioning escapes, Numbuhs One through Five attempt to track him under the supervision of the uptight head of decommissioning, Numbuh 86. Soon the Kids Next Door are torn between trying to find the fugitive and trying to lose 86.
Operation: T.H.E.-S.H.O.G.U.N./Operation: C.O.L.L.E.G.E.
Operation: T.H.E. S.H.O.G.U.N.: When Numbuhs Two and Four discover the town has been conquered by a greedy Cheese Shogun, they take it upon themselves to cut this cheese down to size./Operation: C.O.L.L.E.G.E.: Numbuh One discovers England's most prestigious University has accepted a 10-year-old boy! Convinced that the adults want to steal the new student's brain, he zooms across the ocean only to learn his brain might be just the treat the University is looking for!
Operation: R.E.P.O.R.T./Operation: B.R.I.E.F.
Operation: R.E.P.O.R.T.: After every Kids Next Door mission, reports must be filed, particularly when missions fail. There are many different ways to tell a story, and each operative tries to excuse their failure by making us see it their way./Operation: B.R.I.E.F.: Numbuhs Two through Five are faced with a dilemma: their leader is running around screaming with his tighty-whitey's on his head while Kids Next Door Global Command are trying to brief them on an important mission. Has Numbuh One finally cracked, or could his underwear really be killing him?
Operation: C.A.K.E.D. - T.W.O./Operation: S.P.A.C.E.
Operation: C.A.K.E.D. T.W.O.: Every year, the Kids Next Door attempt to capture and re-distribute the Delightful Children from Down the Lane's extra-super-delicious birthday cake, but this year's heart-stopping aerial battle for the confection is just icing on a cake of betrayal so sour it threatens to ruin even the sweetest victory./Operation: S.P.A.C.E.: A routine re-supply mission to Kids Next Door Global Command Moonbase quickly becomes a rescue mission as Numbuhs One through Five discover that sisters can be more terrifying than spooky space aliens.
Operation: B.E.A.C.H./Operation: U.N.D.E.R.C.O.V.E.R.
Operation: B.E.A.C.H.: On a Kids Next Door beach holiday, Numbuh Three discovers chivalry isn't dead when the king of a nearby sandcastle asks her to become his queen. Too bad he and his fearsome Knights won't take no for an answer!/Operation: U.N.D.E.R.C.O.V.E.R.: The Kids Next Door are given remarkable strategic information about the Adult's Coffee Drilling Operation from an undercover mole deep in the enemy's organization, but can the Kids Next Door trust their new ally not to spill the beans?
Operation: D.O.G.F.I.G.H.T./Operation: T.R.I.P.
Operation: D.O.G.-F.I.G.H.T.: Numbuh Two's pride is damaged and his aircraft are destroyed when a mysterious pilot called "the Kid" takes to the skies. But is this hot-dogging newcomer really the greatest threat to the suburban skies?/Operation: T.R.I.P.: Numbuh Three journeys to her homeland to visit Granny and is tracked by Japan's most villainous masters of disguise, the Interesting Twins from Beneath the Mountain. Numbuh Three has a few surprises up those long sleeves of hers.
Numbuh One is wrongly accused of being 13-years old and ambushed by a decommissioning squad led by Numbuh 86. With no access to his team or his Treehouse, he must rely on his skills and the help of the legendary Numbuh 274 and Numbuh Two's little brother, Tommy, to unravel the conspiracy that threatens to erase the memories of his team and potentially destroy the entire Global Kids Next Door organization!
Numbuh Four finds himself shipped off to an all-girls boarding school with a terrible secret. Will he be able to stop the evil headmistress Margaret on his own, or will Wallabe fail and doom the future of every boy on the planet?
Operation: A.F.L.O.A.T./Operation: L.E.A.D.E.R.
Operation: A.F.L.O.A.T.: When a mission goes wrong and the Kids Next Door crash land into a vast Sea of Asparagus, they have more to worry about than figuring out how to keep their craft afloat./Operation: L.E.A.D.E.R.: Poor Nigie is exhausted from all of his missions, at least according to his girlfriend Lizzie, who decides to do Numbuh One a favor and take over his position as mission leader!
Operation: U.T.O.P.I.A./Operation: R.O.B.B.E.R.S.
Operation: U.T.O.P.I.A.: Numbuh One discovers a perfect island where there are no parents or bedtimes, and you can even have cake for dinner! Can Nigel survive in such a seemingly perfect world?/Operation: R.O.B.B.E.R.S.: Homework Bandits stage a daring hold-up on the 8:30 am school bus, but they don't know that this bus carries Numbuh Four, who's done his homework and Wally don't cotton to bandits messin' with it.
Numbuh Five's rescue mission to save her classmate, Leona, leads to a wild chase down a fantastical and deadly ancient underground school that contains an incredible secret!
Operation: B.U.T.T./Operation: T.R.A.I.N.I.N.G.
Operation: B.U.T.T.: When Numbuhs Two though Five force Numbuh One to take a day off at the beach, they unwittingly set him up to be exposed in the most embarrassing way possible!/Operation: T.R.A.I.N.I.N.G.: Numbuh Two's younger brother, Tommy, and his fellow cadets discover their training simulations in the Kids Next Door Arctic Training Base may not be simulations after all!
Operation: A.R.C.H.I.V.E./Operation: S.L.U.M.B.E.R.
Operation: A.R.C.H.I.V.E.: The true, horrible history of the genesis of the Adult-Child conflict. This is the story the adults don't want you to hear!/Operation: S.L.U.M.B.E.R.: Numbuh Four's determination to join Numbuh 86's sooper-top secret girls-only special mission leads him do whatever it takes, even if that means putting on a little make-up!
Operation: P.I.N.K.E.Y.E./Operation: K.A.S.T.L.E.
Operation: P.I.N.K.E.Y.E.: Hoagie Gilligan, P.I. uses all of his formidable detective skills to discover who's infecting everyone in school with pink eye. He'll wish he didn't./Operation: K.A.S.T.L.E.: A ride down the Rainbow Monkey Sugar Coated Kastle of Love means more action than romance when an old nemesis tracks down Numbuh Three and her younger sister, Mushi.
Operation: C.A.K.E.D.-T.H.R.E.E./Operation: L.O.C.K.D.O.W.N.
Operation: C.A.K.E.D.-T.H.R.E.E.: Once again, the Delightful Children from Down the Lane are determined not to share their extra-yummy birthday cake, but the Kids Next Door won't give up, even when their plans to subdue the Delightful Children accidentally hatch./Operation: L.O.C.K.D.O.W.N.: An emergency Treehouse lockdown has saved the fleeing Numbuh One and his team from their spankiest enemy. Or has it?
Operation: H.U.G.S./Operation: J.E.W.E.L.S.
Operation: H.U.G.S.: Numbuh Four's disgust at anything Rainbow Monkey only increases when he finds himself trapped on Rainbow Monkey Island with a gargantuan, monstrous Rainbow Monkey-Kong./Operation: J.E.W.E.L.S.: Numbuh Five journeys to the exotic Al-Suhgar Desert to recover her stolen candy, the Blurpleberry Supreme, and discovers she's not the only one searching for the powerful, mystical candy.
Numbuh Two's younger brother, Tommy, graduates from the Kids Next Door Academy just as the sinister Father commences his unstoppable plan to destroy the Kids Next Door. Suddenly, Tommy must sacrifice all that mattered to him in order to save his brother and his friends.
Operation: T.R.I.C.K.Y./Operation: U.N.C.O.O.L.
Operation: T.R.I.C.K.Y.: The big question this Halloween is who'll get the most candy this year? Unfortunately, Numbuh Four's candy quest is complicated by the crafty Stickybeard and his horde of Candy Pirates!/Operation: U.N.C.O.O.L.: Numbuh Two convinces the Kids Next Door to journey to a spooky Cyprus Treehouse in the Bayou and rescue the all-important Numbuh 73. But when the others discover the truth about Numbuh 73, is it too late?
Operation: P.R.E.S.I.D.E.N.T./Operation: H.O.S.P.I.T.A.L.
Operation: P.R.E.S.I.D.E.N.T.: The Kids Next Door are employed as the security detail for the 4th Grade Class President on a mission of the utmost importance. Can even the most valiant efforts to protect School Bus One be enough to thwart Father's evil plans?/Operation: H.O.S.P.I.T.A.L.: After a Kids Next Door operative is injured, the Kids Next Door rush to the hospital to protect the patient from a teenage attack, but are they the ones who need protecting?
Operation: S.P.R.O.U.T./Operation: H.O.U.N.D.
Operation: S.P.R.O.U.T.: Numbuh Four accidentally eats a Brussels sprout, sending the rest of the Kids Next Door on an emergency fantastic voyage to stop the dreaded vegetable from being ingested./Operation: H.O.U.N.D.: When Numbuh Five tells her teacher a vicious dog ate her homework, she's not lying, but the truth about the beast is even more frightening!
Operation: R.A.B.B.I.T./Operation: F.L.U.S.H.
Operation: R.A.B.B.I.T.: Numbuhs Two and Five venture into the deep, dark vastness of the Jungle Gym to find the Second Grade's missing bunny only to discover an old nemesis with a horrible, yet sugary, secret awaits them!/Operation: F.L.U.S.H.: In an attempt to capture the Kids Next Door's Treehouse, the Adult villains learn there's no such thing as a fool-proof plan when the fool you're dealing with is the Toilenator!
Operation: F.O.O.D.F.I.T.E./Operation: C.L.U.E.S.
Operation: F.O.O.D.F.I.T.E.: Gramma Stuffum unleashes a gastronomic grossness on the school in a Rock Opera that's hard to swallow!/Operation: C.L.U.E.S.: When a friendly Sunday dinner with Numbuhs Two and Three's families takes a deadly dramatic turn only Hoagie's detective skills can solve the case!
Operation: N.U.G.G.E.T./Operation: M.A.C.A.R.R.O.N.I.
Operation: N.U.G.G.E.T.: Numbuh Four's discovery of a chicken nugget in a local stream creates a stampeding Chicken Nugget Rush of condiment cowboys!/Operation: M.A.C.A.R.R.O.N.I.: The bumbling Numbuh 13 warns the Kids Next Door of a sinister Adult scheme to ransack the Macaroni Museum of Art, but is this informant more trouble than the villains?
When Numbuh Four's pool becomes a portal to a negative universe, the fate of both worlds depends on Wally defeating the smartest evil genius ever!
Operation: C.A.K.E.D.- F.O.U.R.
It's an all out tubing battle when Toobathon is made sweeter by the Delightful Children from Down the Lane's promise to donate their extra-scrumptious Birthday Cake to the winner! Can Numbuh Two and his trusty tube get their cake and eat it too?
Operation: S.I.T.T.E.R./Operation: S.A.T.U.R.N.
Operation: S.I.T.T.E.R.: When Hoagie discovers the beautiful yet dangerous Cree is his babysitter, will it be a dream come true or turn into a nightmare?/Operation: S.A.T.U.R.N.: The Kids Next Door are the last hope for little girls all over the world as a mysteriously powerful entity known as RAMON 4 propels all of the world's Rainbow Monkeys into deep space.
Operation: C.H.O.C.O.L.A.T.E./Operation: M.A.T.A.D.O.R.
Operation: C.H.O.C.O.L.A.T.E.: While hunting for Marshmallows on the red planet, Numbuh Five's family and friends are attacked by a bitter enemy that has become only a hollow shell of the boy he was before!/Operation: M.A.T.A.D.O.R.: When the Kids Next Door prepare to attack the sinister Soccer Mom, Numbuh Four must choose between the mission or his new secret gig as a matador at the BullyFights.
Operation: L.U.N.C.H./Operation: M.U.N.C.H.I.E.S.
Operation: L.U.N.C.H.: Lizzie spends all day fixing a romantic lunch for Nigie only to have it snatched by Robin Food and his merry band, a gang of crazy men in tights who steal lunch from the young and give to the old!/Operation: M.U.N.C.H.I.E.S.: The most important battle of the day begins when 2x4 technology scans locate the very last box of delicious, sugary Rainbow Munchies on aisle sixty-teen of the Super-Villains-Super-Market.
Operation: K.N.O.T./Operation: C.L.O.S.E.T.
Operation: K.N.O.T.: Numbuh One risks his neck when he teams up with an adult to battle a giant horde of horrible, snake-like school ties!/Operation: C.L.O.S.E.T.: When an innocent kid opens his closet door and disappears into a gi-hoogic avalanche of unhung, unfolded clothes, it's up to the Kids Next Door to scale the mountain of and rescue him!
The only thing worse for Nigel than being sick on the first snow day of the year is when the evil Fourth Grade President attempts to capture and return every kid to school for a special assembly!
When Sector V's original leader, Maurice, turns 13 and submits to decommissioning, Numbuh Five is determined not to let her old boss become an agent of evil in his teenaged years. Can she succeed with her older sister Cree actively recruiting the skillful boy?
Operation: L.O.V.E./Operation: C.O.U.C.H.
Operation: L.O.V.E.: A romantic musical starring Numbuh Three asks the question: Can her secret love survive the slings and arrows of outrageous fortune?/Operation: C.O.U.C.H.: When a squabble between Numbuhs Three and Four over the remote control leads to the device accidentally falling into the couch, Numbuh Four dives into the depths of the cushions, only to discover an ancient underworld that worships his remote!
Operation: D.O.D.G.E.-B.A.L.L.: As the very powerful, supernatural Dodge-Ball Wizard vanquishes the world's great Dodge-Ball Monks, only one battle remains; a gi-hoogic contest against the one known as Beetles!/Operation: F.E.R.A.L.: When a mission to extract a super important code from the Delightful Children from Down the Lane fails, Numbuh One crash-lands on Rainbow Monkey Island! Can Nigel's teammates bring him back to civilization before he's totally apefied and retrieve the code?
When the North Pole is attacked and Santa's gift giving device (the R.E.I.N.D.E.E.R. 4000) is stolen, all clues point to the Kids Next Door. Now, Numbuhs One through Five must defend themselves against an elite squad of super-powered elves while trying to discover who set them up before every Christmas present in the world is turned into coal!
The election for fourth grade president has arrived, and the Delightful Children from Down the Lane plan to use it to take over the school!
Operation: D.U.C.K.Y./Operation: D.I.A.P.E.R.
Operation: D.U.C.K.Y.: Forced to take a bath, Tommy finds himself shanghaied by a cleanliness-fearing sea captain and his happily dirty crew. When a monstrous yellow rubber duck that prowls the uncharted bath waters appears, the crew prepares to abandon ship!/Operation: D.I.A.P.E.R.: Numbuh One suspects that the only reason babies would be in hospitals is so that sinister adults can turn them into adults faster! The Kids Next Door embark on a mission to set the babies free but the babies don't seem to want to cooperate!
Operation: B.U.L.L.I.E.S./Operation: F.I.S.H.Y.
Operation: B.U.L.L.I.E.S.: Spitballasauruses! Noogieraptors! The dreaded Wedgiesaurus Rex! They all roam free on an island created by a brilliant and entrepreneurial kid scientist harboring a secret, a secret Numbuhs Two and Four will soon learn in the end./Operation: F.I.S.H.Y.: To give Numbuh Three's dead goldfish a proper burial, Numbuhs Two and Four go on an epic quest to the forgotten other side of the treehouse where they must drop the fish into a giant toilet. The Crazy Old Cat Lady's craving for seafood creates an epic battle over the rapidly deteriorating delicacy.
Operation: B.R.E.A.K.U.P./Operation: S.A.F.A.R.I.
Operation: B.R.E.A.K.U.P.: When Numbuh Four uncovers a Vaseball league, where kids shatter every breakable object into a kajillion pieces, will he save his mom's prized vase or go for the home run?/Operation: S.A.F.A.R.I.: When Numbuh One is forced to go the doctor to get his moosebumps shot, he enters into a dangerous game of survival as the doctor really wants him to take his medicine!
Operation: V.I.R.U.S./Operation: O.U.T.B.R.E.A.K.
Operation: V.I.R.U.S.: The evil Cree is leaving a path of destruction in her wake as she desperately seeks Number Five and an antidote. Can Numbuh Five and the Kids Next Door stop this teen gone wild?/Operation: O.U.T.B.R.E.A.K.: The Kids Next Door are sent to the Kids Next Door Deep Sea Science Lab to contain a deadly virus carried by Patient C. Can the Kids Next Door and the collective IQs of 200 dorky boy scientists save the day?
Operation: C.A.N.Y.O.N./Operation: H.O.L.I.D.A.Y.
Operation: C.A.N.Y.O.N.: The Global Kids Next Door anniversary celebration is approaching, and Numbuh One leads his team in arranging something that no kid will ever forget! Now, if they could only find a spoon!/Operation: H.O.L.I.D.A.Y.: After a horrible pie-related disaster, Numbuh One's insanely jealous girlfriend Lizzie is forced to land a pilot-less plane full of hysterical hamsters. Can Numbuh One guide her safely down? Considering the mood she's in, does he want to?
For his Delightful Children's birthday this year, Father has created the deadliest cake ever. Can a long lost Kids Next Door operative help defeat him?
Operation: R.E.C.R.U.I.T./Operation: D.A.D.D.Y.
Operation: R.E.C.R.U.I.T.: A Kids Next Door fanboy finds his dreams answered when he's recruited by the Kids Next Door! Not every average Joe and Jane in the sandbox is up to the task of the intense recruitment program. Can he handle the final mission that may expose this fanboy's inner child?/Operation: D.A.D.D.Y.: Dads are always trying to give their kids bad haircuts, but this dad has gone too far! With only rookies operatives at his side, Numbuh One must race against the clock to save this amateur barber's next victim!
Operation: C.L.O.W.N./Operation: S.P.A.N.K.E.N.S.T.I.N.E.
Operation: C.L.O.W.N.: Numbuh Two's jokes, puns and gags have suddenly made him a marked man. Turns out there's a guy with a big, red nose who's lost his sense of humor and doesn't take kindly to class clowns!/Operation: S.P.A.N.K.E.N.S.T.I.N.E.: Numbuh Three's little sister, the formerly sweet Mushi, has never forgiven Numbuh Two for getting her grounded for double life! She insists that revenge is best served with a good, painful spanking and a whole lot of chocolate sauce!
Operation: H.O.T.S.T.U.F.F./Operation: M.I.S.S.I.O.N.
Operation: H.O.T.S.T.U.F.F.: No one is allowed to touch the thermostat in Mr. Sanban's house! When Numbuh Three goes against his wishes and turns up the heat, everyone gets a little hot under the collar!/Operation: M.I.S.S.I.O.N.: Numbuh Four secures the release of several of the Kids Next Door's most evil-est adult villains from the Kids Next Door arctic prison for a triple double extra secret mission! After a grueling training regime, the team is ready to strike!
Operation: L.I.C.O.R.I.C.E./Operation: H.O.M.E.
Operation: L.I.C.O.R.I.C.E.: When candydom's most devious candy pirate awakens with sugar and evil on his mind, Numbuh Five has to team up with her old foes Stickybeard and Heinrich to defeat this new menace and solve the mystery of the black licorice!/Operation: H.O.M.E.: When one of Numbuh Three's beloved Rainbow Monkeys gets too old to play, she decides to let him spend the rest of his days in peace at Fluffy Meadows, a Rainbow Monkey retirement home. Fluffy Meadows turns out to be anything but peaceful.
While being the leader of the Global Kids Next Door sounds like the coolest job in the world, Numbuh 362 has had enough! When she orders a new global leader be chosen, with every operative in the world involved, an unlikely candidate throws his hat in the ring!
Operation: E.N.G.L.A.N.D./Operation: A.W.A.R.D.S.
Operation: E.N.G.L.A.N.D.: During a family trip back to England, Numbuh One is drawn into a mission to protect a very mysterious book. Is it the English Kids Next Door he is helping or the Delightful Children from Down the Lane's English compatriots, the Rowdy Hooligans from Across the Square?/Operation: A.W.A.R.D.S.: The Emmys? The Oscars? Boring! If you wanna watch a really good award show, then check out the Villain Choice Awards! That's just what the Kids Next Door plan to do, right before they wreck the festivities.
A safety obsessed Senator spends eleventy-billion dollars to construct an army of colossal robots capable of firing blasts that encase swingsets, bicycles, Rainbow Monkeys and anything that could possibly harm kids in bubblewrap. Eventually the robots come to realize there's still one thing that remains dangerous to kids, adults!
Operation: R.E.C.E.S.S/Operation: H.A.M.S.T.E.R.
Operation: R.E.C.E.S.S.: Gallagher Elementary's Principal Sauerbraten discovers a reserve of salad oil under the school's playground and now plans to turn recess into a hard labor camp in order to produce and market the delicious oil./Operation: H.A.M.S.T.E.R.: When the Kids Next Door head off on a mission, the hamsters find themselves under attack by the Insidious Felines From Atop the Litterbox.
Numbuh One wakes up one morning to find he's entered his own worst nightmare! Not only is he an adult, but he has a job -- the President of the United States! What's worse, he's the only one that realizes something is not right. Can he find out what's happening before his own government stamps out the Kids Next Door once and for all?
Operation: S.P.I.N.A.C.H./Operation: M.E.S.S.A.G.E.
Operation: S.P.I.N.A.C.H.: The shores of Gallagher Elementary are invaded by the Spinach Armada who are on a crusade to make kids everywhere enjoy spinach. The Kids Next Door are not about to let their fellow students be tortured into spinach eaters./Operation: M.E.S.S.A.G.E.: The Kids Next Door run a Pony Express-like note passing service at Gallagher Elementary, boasting not a single note they've delivered has been read in front of the class. When Numbuh Two is given the task of delivering an important note, it seems that everyone in school including the Six Gum Gang and a tribe of wild kindergarteners are out to stop him!
Operation: B.R.I.D.G.E./Operation: S.I.X.
Operation: B.R.I.D.G.E.: The Kids Next Door, along with the militant Numbuh 20,000, must destroy a crosswalk bridge that leads to a mall store selling the ugliest clothes ever. The mission hits a huge snag when Numbuh Five discovers a tribe of kids living inside a clothing rack inside the store./Operation: S.I.X.: After promising a mysterious girl that he won't let her birthday party go soda-less (soda is illegal to anyone under the age of 13), Numbuh Two takes the wheel of a tanker truck filled with nine-kajillion gallons of the carbonated good stuff. With Numbuh Three riding shotgun and Numbuh Six fighting off Mr. Fizz and the Soda Control Board pursuers, it won't be a smooth ride.
Tommy falls in love with Hoagie's old tricycle he finds in the garage but gets only laughs from other kids when they see him riding it. Using his 2x4 technology expertise, Tommy rebuilds it to make it the best bike in the whole world, but the tricycle's AI takes its mission way too seriously and goes out of control destroying other kids' bikes left and right!
Operation: C.R.I.M.E./Operation: P.A.R.T.Y.
Operation: C.R.I.M.E.: When a new psychic member of the School Safety Patrol gets kids tossed into detention for crimes they haven't yet committed, the Kids Next Door have to uncover his real motives before every kid is locked up./Operation: P.A.R.T.Y.: The Delightful Children from Down the Lane invite Chad and the teens over to discuss their evil plans to defeat the Kid Next Door. Things quickly get out of hand as the teens invite everyone they know, turning the Delightful Children's mansion into a huge house party. Now, there's only one place the Delightful Children from Down the Lane can turn to help them get rid of the partiers before Father comes home, the Kids Next Door!
Operation: D.O.G.H.O.U.S.E./Operation: P.L.A.N.E.T.
Operation: D.O.G.H.O.U.S.E.: After Numbuh Five wanders into an eerie haunted doghouse, strange things start to happen. Namely, the Kids Next Door's homework begins to mysteriously disappear!/Operation: P.L.A.N.E.T.: While attempting to break the Ridiculous Barrier, Numbuh Four and Numbuh Three lose control and crash a new hyperspeed 2x4 tech rocket. To his horror, Numbuh Four awakes to find Numbuh Three missing and himself on a Planet of the Apes-type world.
Operation: S.C.I.E.N.C.E./Operation: A.M.I.S.H.
Operation: S.C.I.E.N.C.E.: To the untrained eye, the science fair looks like just a bunch of lame fake volcanoes and cheesy electrical experiments. After the adults leave, the best and brightest 2x4 technicians pull out the real technology to hawk to other Kids Next Door sectors!/Operation: A.M.I.S.H.: Dozens of the top Kids Next Door scientists and 2x4 tech specialists are kidnapped during a bold raid at a Kids Next Door technology fair. Numbuh Two barely escapes capture by the attackers who Numbuh One thinks just might be a splinter cell of the Kids Next Door creating a dangerous new weapon to forever rid the world of adults!
Lizzie's always had to compete with the Kids Next Door for Nigel's attention, but now it seems she has a rival for his love! What kind of person would do such a thing? Turns out it's not a person at all.
Operation: C.A.R.A.M.E.L./Operation: M.O.O.N.
Operation: C.A.R.A.M.E.L.: In a quest for sweet revenge against Numbuh Five, Heinrich unleashes his most diabolical plan, the ancient Mayan recipe for the most delicious caramel ever! All he needs to make this golden treat is tons of sugar and a sacrifice of something precious from anyone standing in his way!/Operation: M.O.O.N.: Yes, the original moon landing was actually faked by the Kids Next Door who didn't want their Moonbase discovered by adults!
In a surprise move, the teens offer a historic truce to the Kids Next Door organization, but the peace process is threatened when things turn out to be not what they appear. Is the powerful Kids Next Door diplomat a member of the splinter cell with designs on ruining the treaty negotiations? Does the teen arch enemy Chad have a plan of his own? When Nigel is suspected of treason, arrested and handcuffed to Chad, can they work together to save the future of the Kids Next Door?