In "Operation: C.A.T.S. (Crazy Aged Tyrant Stinks)", Numbuh 4 accidentally demolishes Numbuh 3's favorite toy and winds up the hands of a creepy old cat lady and her whole mess of cats. In "Operation: P.O.P. (Pre-Teens Oppose Prohibition)", the legal drinking age for soda, especially root beer, has been raised to 13, and the KND have to rely on speakeasies for youngsters to drink the liquids. But it all goes south when the prohibition leader, Mr. Fizz, has an even nastier surprise in store for children everywhere.

In "Operation: S.P.A.N.K. (Sore Posteriors Annoy Naughty Kids)", when he gets jailed for spanking an innocent child, Count Spankulot vows to reform and use his powers to help children instead. He tries to team up with the KND, but they are not at all keen on the idea of him being with them. In "Operation: D.A.T.E. (Dance Actually Threatens Everyone)", the Delightful Children From Down the Lane are throwing a party and everyone is invited, including the KND. Knowing the foes, Numbuh 1 is confident the whole thing is not what it seems, so the team goes to their foes' ...

In "Operation: S.U.P.P.O.R.T. (Special Underwire Protection Proportedly Outfits Rotten Teenagers)", Numbuhs 1 and 2 go to Numbuh 5's house to protect Numbuh 5 from enemy attacks when she falls sick. But her teenage sister Cree arouses Numbuh 1's suspicions of her being an enemy of the KND, particularly when he suspects that her bra may be used as a weapon against them. In "Operation: T.A.P.I.O.C.A. (Teens And Pudding Inconvenience Our Childish Agents)", a routine mission to stop a trio of teens from driving a truckload of tapioca into town goes south when the stuff ...

"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 KND quickly devise a super-simple "mission" for her to go on, unwittingly putting her in mortal danger!

In "Operation: O.O.M.P.P.A.H. (Obnoxious Overzealous Male Parent Plays Annoying Horn)", against his will, Numbuh 1 goes on a fishing outing with his overbearing father who enjoys playing the sousaphone. In "Operation: S.H.A.V.E. (Southern Hair Attacks Virtually Everyone)", facial hair has been spotted growing on the faces of various southwestern KND operatives and the Sector V operatives investigate this invasion.

"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...

In "Operation: G.H.O.S.T. (Ghostly Hamsters Overwhelm Spooky Treehouse)", Numbuh 3 mourns the loss of one of the hamsters in the treehouse, which is, that night, overrun by the spirits of other deceased hamsters that kidnap Numbuh 3 and drag her away to their afterlife! In "Operation: F.U.G.I.T.I.V.E (Facing Unpleasant Girl's Insulting Taunts Isn't Very Enjoyable)", the KND is forced to side with a grumpy operative, Decommissioning Officer Numbuh 86, to bring in an operative who has reached his/her thirteenth birthday.

"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 that 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 that HIS brain might be just the treat the University is looking for!

In "Operation: R.E.P.O.R.T. (Ridiculous Exaggerations Possess Occasional Real Truth)", each Kids Next Door operative tells their side of the story of their attempts to deliver a flat square box referred to as 'the goods' and keep it out of the hands of the Delightful Children from Down the Lane. In "Operation: B.R.I.E.F. (Big Reward If Enemy Finished)", the rest of the Kids Next Door try to figure out what's going on when Numbuh 1 starts running around with his underwear on his head, screaming that it's attacking him. Worse, they must find a way to explain the strange...

In "Operation: C.A.K.E.D.-T.W.O. (Commandos Attempted Kapturing Enemy's Dessert - They Weren't Obliging)", the Delightful Children hold another birthday party in their same sadistic way: they and only they get to eat the cake and their guests get nothing at all. But, like clockwork, not if the KND can help it. So the sly miscreants disappear with the dessert and will stop at nothing to keep their foes from getting their hands on it, even if it includes hiring Numbuh 1's own girlfriend, Lizzie Devine, to slow their pursuers down. In "Operation: S.P.A.C.E. (Sister's ...

In "Operation: B.E.A.C.H. (Boys Enthusiastically Assume Chivalrous Heroics)", at the beach, which Numbuh 1 leaves promptly (he dislikes it), Numbuh 3 is spirited away by the Knights of the Round Towel and taken by them to King Sandy, a miniature monarch within a HUGE sandcastle. Numbuh 4 hears of the kidnapping and goes with Numbuhs 2 and 5 to save her. Meanwhile, however, Sandy falls in love with Numbuh 3 and plans to marry her. All the while, the KND try to interfere with this engagement. In "Operation: U.N.D.E.R.C.O.V.E.R. (Unusual New Defective Eagerly Reveals ...

In "Operation: D.O.G.F.I.G.H.T. (Dueling Over Gooey Frankfurters Inevitably Gives Hoagie Trouble)", Numbuh 2, one of the best pilots in the organization, suddenly finds himself being bested by another, more mysterious kid pilot who, like Numbuh 2, has a 2X4 aircraft of his own, which he uses to shoot down all of Numbuh 2's 2X4 aircraft. But when they both realize their supplier has been scamming them into battling one another so that he could destroy every chili dog in town, the dueling dog-faces team up to get even with him. In "Operation: T.R.I.P. (Twins ...

In "Operation: E.N.D. (Everyone Nearly Decommissioned)", Numbuh 1 finds out that he and his teammates are going to be decommissioned, despite the fact that none of them has reached the age of thirteen yet. On the run from the decommissioning squad, Numbuh 1 must discover who is behind this strange turn of events and help his friends before it's too late.