S4 E1 • Operation: R.A.B.B.I.T.

The Temple of Doom, of the KND parodies. Abigail and Hogie venture deep into the Jungle Gym to recover Mr. Fluffleupagus, the second grade mascot bunny, & come across Heinrich Von Marzipan who has a sticky plot in store.

Première diffusion : 19 novembre 2004

S4 E2 • Operation: F.L.U.S.H.

In an attempt to capture the KND's Treehouse, the Adult villains learn that there is no such thing as a "foolproof" plan when the fool you're dealing with is the Toilenator!

Première diffusion : 19 novembre 2004

S4 E3 • Operation: F.O.O.D.F.I.T.E.

Grandma Stuffum returns as the cafeteria lady with some sinister recipes.

Première diffusion : 5 novembre 2004

S4 E4 • Operation: C.L.U.E.S.

A dinner with Numbuh 2's family turns sour when Numbuh 3's Sigh & Care Rainbow Monkey is found with a fork in it's back, it's up to Hoagie to find this monkey murderer.

Première diffusion : 5 novembre 2004

S4 E5 • Operation: N.U.G.G.E.T.

Numbuh 4 tries to protect chicken nugget mines from the DCFDTL.

Première diffusion : 3 décembre 2004

S4 E6 • Operation: M.A.C.A.R.R.O.N.I.

The KND try to protect the Macaroni Museum of Art from being ransacked, with the worst KND operative ever, Numbuh 13, on their side.

Première diffusion : 3 décembre 2004

S4 E7 • Operation: P.O.O.L.

Prevent Opposite Operative's Larceny: Numbuh 4's new pool contains a portal that leads into a "negative" equivalent of the KND's world, where children obey evil dictator Negative Numbuh 4 and work for adults. A parody of Star Trek's "Mirror, Mirror".

Première diffusion : 19 novembre 2004

S4 E8 • Operation: C.A.K.E.D.-F.O.U.R.

Children's Annual Kompetition Exposes Devilishly – Fiendish Operation Up River: When the Delightful Children promise their birthday cake to the winner of the Tubathon, everyone is raring to go, especially Numbuh 2. With his old tube Betsy, and his "Farfegtubing", will Numbuh 2's dreams come true? Or do the Delightful Children have other plans?

Première diffusion : 26 novembre 2004

S4 E9 • Operation: S.I.T.T.E.R.

Sweetheart's Involvement Transforms The Evening's Reality. Cree Lincoln becomes the Gilligan bros.'s new babysitter. A parody of Little Nemo: Adventures in Slumberland.

Première diffusion : 29 avril 2005

S4 E10 • Operation: S.A.T.U.R.N.

Stuff Abducted Turns Up Nowhere The KND try to stop a mysterious being from collecting all the Rainbow Monkeys in the world-- including Numbuh 3's beloved toys. A parody of Star Trek: The Motion Picture.

Première diffusion : 29 avril 2005

S4 E11 • Operation: C.H.O.C.O.L.A.T.E.

Numbuh 5 tries to stop a chocolate monster from destroying her friends.

Première diffusion : 10 décembre 2004

S4 E12 • Operation: M.A.T.A.D.O.R.

Numbuh 4 must choose between his job as a KND operative or be a bully fighter.

Première diffusion : 10 décembre 2004

S4 E13 • Operation: L.U.N.C.H.

Première diffusion : 21 février 2005

S4 E14 • Operation: M.U.N.C.H.I.E.S.

Première diffusion : 21 février 2005

S4 E15 • Operation: K.N.O.T.

Première diffusion : 29 avril 2005

S4 E16 • Operation: C.L.O.S.E.T.

Première diffusion : 29 avril 2005

S4 E17 • Operation: S.N.O.W.I.N.G.

Jimmy McGarfield (the fourth-grade president) forces other kids back into school on a first snow day for a special assembly after Numbuh One is too sick to play. A parody of Star Wars Episode V: The Empire Strikes Back and the buswalkers of The War of the Worlds.What's worse than Numbuh 1 being sick on the first snow day of the year? Why, the evil Fourth Grade President Jimmy spoiling everything, of course! The nasty Class President wants everyone back at school for a special assembly, especially for selfish reasons. When the other 4 try to stop Jimmy by rallying the kids against him, their attempts are unsuccessful and they are immediately captured. When Jimmy tries to crown Lizzie his queen with a Girlfriend/Boyfriend Helmet, Numbuh 1 must defeat Jimmy and free her despite his cold. Anna eventually frees the KND and helps Numbuh 1 infiltrate the school. At the start of the assembly, the final fight began. As the KND thrash President Jimmy's Hall Monitors, Numbuh 1 and Jimmy face off with rulers and brooms (parody of light sabers) but Numbuh 1 is knocked down by Jimmy. As Jimmy tries to finish him off, Nigel uses the thermos containing Lizzie's disgusting soup, which she gave him earlier, as a shield. The thermos breaks and the soup drops to Lizzie where the girlfriend helmet is broken due to the soup. The battle is over and Commandos sent by KND Global Command arrive to apprehend Jimmy and Anna. As Jimmy is being apprehended, Anna reveals her love for Jimmy. Numbuh 4 is disgusted by this and when he says that he will never act "lovey-dovey" with anybody, Numbuh 3 pushes him onto the ground and walks away angry

Première diffusion : 20 mai 2005

S4 E18 • Operation: M.A.U.R.I.C.E.

Maurice, a member of the Kids Next Door is de-commissioned. Numbuh 5 is saddened by it, and suggests that they monitor Maurice to make sure the teenagers don’t recruit him.The episode starts when a group of Teens break in to ten year old Numbuh 9's bedroom. Thinking that he is asleep, they try to fire their 'Pox Gun' at him. Suddenly, Numbuh 9 leaps up and yells for the rest of his team, the old Sector V, and they bravely fight off the Teens.

Première diffusion : 8 juillet 2005

S4 E19 • Operation: L.O.V.E.

Première diffusion : 15 juillet 2005

S4 E20 • Operation: C.O.U.C.H.

Première diffusion : 15 juillet 2005

S4 E21 • Operation: D.O.D.G.E.B.A.L.L.

Première diffusion : 22 juillet 2005

S4 E22 • Operation: F.E.R.A.L.

Première diffusion : 22 juillet 2005