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

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It is a sad day in the treehouse, when Chubbo, one of the KND's power-providing hamsters passes away; and it is saddest for the overly sensitive Numbuh 3, who even maintains a vigil at his grave until the weather proves inclement. But unwise is the one who mourns too long for the dead, because during the dark and stormy night, a gang of ghostly hamster arrive, and drag the terrified Three to the hamster afterlife! Now the team must penetrate the very netherworld to rescue their friend, but can even the KND overcome a mob of restless rodents?!

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.

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!

A dinner get-together between Numbuh 2 and Numbuh 3's respective families turns sour when Numbuh 3's Posh Party Rainbow Monkey doll is badly damaged with a fork in its back. Now it's up to Numbuh 2 to figure out the murderer of the doll.

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The true history of the genesis of the Adult-Child conflict is revealed. This is the story the Adults do not want you to hear.

Numbuh 4 discovers a chicken nugget that initiates a chicken nugget rush.

Everyone's collections of Rainbow Monkey toys are mysteriously vanishing. The KND investigate and discover the toys revolving around the planet Saturn as its big ring!

On a seemingly routine mission, Numbuh 2 seizes a truckload of disgusting tapioca pudding from a trio of masked teenagers; unfortunatly, when trying to dispose of it, he plants it right in the middle of the treehouse! Now the team is up to their necks trying to clean up the putrid pudding, and the original teen-age owners still want it back! But why? Only Numbuh 2's grandmother knows for su

While on a fishing trip with his overbearing, sousaphone-playing father, Numbuh 1 has to rescue him from a kid seeking a father of his own.

Everbody knows that ice cream comes in three basic flavors - chocolate, vanilla, and strawberry. But Numbuh 5 knows only too well the legend of how the ancient ice cream monks created a FOURTH basic flavor, and hid it away in a hidden temple, where only an ice cream lover with the purest taste buds could ever taste it. But when the Delightful Children steal the sacred Golden Scoop, Numbuh 5 finds herself dragged to the trap-laden temple, where the evil children force her to penetrate its inner sanctum. Will Numbuh 5 prevail in this frozen frenzy and get a taste of the fabled Fourth Flavor?!

Nigel is exhausted and dirty after a hard mission, and when he takes a break, Lizzie intercepts a mission spec from Numbuh 65.3. Deciding to give Nigel a break, Lizzie tricks the rest of the team into thinking Nigel put him in charge, and assumes the role as leader. But Lizzie i

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

Numbuhs 2 and 5 must rescue the first grade class's pet rabbit before it is turned into a chocolate bunny by Heinrich Von Marzipan.

Numbuh 4's newly-installed backyard pool is the portal into an alternate dimension where everything is the opposite of everything in the real world.

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When the Kids Next Door discover a plan to ruin Christmas, they must team up with Elfa Strike to save the day.

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