The Kids Next Door attempt to stop a party for their enemies.

The KND learn about evil mustaches taking over the faces.

The Delightful Children once again hold their annual birthday party in the usual sadistic manner planning to eat their cake and not let any of their unwilling guests have so much as a taste.

Numbuh 2 has always been one of the best pilots in the organization but one day while taking his 2X4 aircraft for a spin, he's shot down by a mysterious child pilot with a 2X4 plane of his own. 2 seeks revenge, but the pilot is untouchable, and manages to shoot him down out of every aircraft in the team's arsenal. Considering giving up, piloting, finally finds a way to defeat the pilot only to discover that his supplier has been fooling them both into fighting each other in a plot to destroy every chili dog in town!

Numbuh 4 learns he is to be sent to a boarding school but he isn't worried, as he's always escaped from them before. But then he learns that the school is being run by the evil child Madam Margie, a girl who is getting high-tech aid from none other than her future self! Madam Margie's abominable plan is to create a twisted utopia where girls rule the world, using a demonic weapon called the girlifying ray that can turn anything feminine! The team seeming doesn't stand a chance until they recieve aid from a strange source Numbuh 4's OWN future self!

The evil Chester is developing his Happy Headband a strange device he plans to sell to parents to keep kids out of their hair.

Numbuh 2 has set up a private eye office in the school janitor closet and soon he gets his first case someone is inflicting students with bad cases of pink-eye. When Numbuh 86 becomes the latest victim and he gets no help from Joe the hall monitor (his old partner before he joined the KND) 2 does some of his own deductive work until Joe attacks him.

Numbuh 4's disgust at anything Rainbow Monkey only increases when he finds himself trapped on Rainbow Island.

Kenny and Chimpy are hired to do chores.

Mr. Wink and Mr. Fibb extend adult swim time.

The Kids Next Door set off on a mission to the ice cream factory.

With Numbuh One away, the Treehouse becomes an easy target for adults

The hamsters that power the Treehouse go on vacation, leaving the team vulnerable.

The Kids Next Door are put in the crosshairs of Knightbraces.

Stickybeard and his crew sniff out the Kids Next Door's candy depository.

The team meets the last member of another era's Kids Next Door.

When turnips are found everywhere in Sector V's treehouse, they go to the source: a giant turnip, to defeat it.

After Numbuh 2 beats a mini-golf champion at mini-golf, the golfer shrinks Numbuh 2, and a whole lot of sights from around the world.

When his father brings Numbuh 4 to work for "Bring Your Daughter To Work Day", Numbuh 4 discovers his father's boss plans to send him and all the daughters of his coworkers to Pluto.

A fellow operative, Numbuh 30c, is sent to help Sector V stop a villain from using a weather machine to make no more snow days for school. It turns out that he was not helping, because he sent them the wrong directions, ignored their cries for help, and sent a missle to attack them.

The Delightful Children From Down The Lane attack Sector V's headquarters with an infestation of hair-eating lice. After the KND find out they don't like nacho cheese, they decide to shoot nacho cheese at them to get rid of them.

Numbuh 1 has a secret girlfriend who is bent on mind controling him! So, Numbuh 1's friends have to save Numbuh 1 from being mind controlled or their days as KND could be numbered.

A fly finds its way into Sector V's headquarters.

All of the teenagers in Sector V's hometown have formed a place called The Point, and Numbuh 1 suspects that they are helping the adults.

A villainous half-man, half-baby named Mr. B gives the Kids Next Door a television series of their own.