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

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.

Numbuh 2's little brother, Tommy (who is shunned by Sector V) joins forces with a villain, Common Cold.

Numbuh 4 accidently destroys Numbuh 3's favorite toy, and then lands himself in the clutches of the creepy old cat lady and her billions of cats! Will his fellow operatives save him? And will Numbuh 3 forgive him in time TO save him?

When Numbuh 4 is sickened by the cutsey "Rainbow Monkeys" double feature movie that the team goes to, he tries to theater-jump into to R-rated "Violence: The Movie," and after several unsuccessful tries, he makes it in disguised as an adult. But triumph turns to tragedy when he discovers that what promises to be a cool film is actually a front for a meeting for practically every villain that the KND have ever faced! And when his diguise fails, will Numbuh 4 escape this sinister cinema and leave room for a sequel?!

The KND take a vacation to the beach (and Numbuh 1 promptly leaves, since he hates the place), where Numbuh 3 is quickly kidnapped by the armored Kinights of the Round Towel, who drag her before King Sandy, a miniature monarch who quickly falls in love with her! Naturally, the concerned Numbuhs 4 with Numbuhs 2 and 5 confronting the beachcombing brat in his enormous sandcastle... but they are soon overwhelmed. Can the KND topple this tiny tyrant before high tide?

The Team attempts to crash the Annual We Hate The Kids Next Door Barbecue, only to find that the party has far more villains than they can handle! The team flees in their M.E.G.A.R.A.G.E aircraft, but Stickbeard and his band of buccaneers do not give up pursuit! When their craft is shot down by the Sweet Revenge, they land in the worst of places - in the middle of the ocean, in a disgusting sargasso of asparagus! Stranded, lost, with no edible food, a bad situation gets much worse when they are found by a great white aspargus monster! And when the vile vegetable seeks to make them its prey, all hope seems lost. Can their be any escape from this savage sprout?!

Numbuh 4 accidentally eats a brussels sprout, sending the rest of the KND on an emergency Fantastic Voyage to stop the dreaded vegetable from being digested.

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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