1x1 - Operation: C.A.K.E.D.

December 6, 2002

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

1x2 - Diseasy Does It

December 6, 2002

Kenny and Chimpy are hired to do chores.

1x3 - No P in the OOL

December 6, 2002

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

1x4 - Operation: I.-S.C.R.E.A.M.

December 6, 2002

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

1x5 - Operation: C.A.N.N.O.N.

December 6, 2002

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

1x6 - Operation: N.O.-P.O.W.U.H.

December 13, 2002

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

1x7 - Operation: T.E.E.T.H.

December 13, 2002

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

1x8 - Operation: P.I.R.A.T.E.

December 20, 2002

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

1x9 - Operation: C.O.W.G.I.R.L.

December 20, 2002

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

1x10 - Operation: T.U.R.N.I.P.

December 27, 2002

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

1x11 - Operation: M.I.N.I.G.O.L.F.

December 27, 2002

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.

1x12 - Operation: O.F.F.I.C.E.

January 3, 2003

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.

1x13 - Operation: A.R.C.T.I.C.

January 3, 2003

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.

1x14 - Operation: L.I.C.E.

January 10, 2003

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.

1x15 - Operation: L.I.Z.Z.I.E.

January 10, 2003

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.

1x16 - Operation: T.H.E-F.L.Y.

January 17, 2003

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

1x17 - Operation: P.O.I.N.T.

January 17, 2003

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.

1x18 - Operation: C.A.B.L.E.-T.V.

January 24, 2003

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

1x19 - Operation: C.A.M.P.

January 24, 2003

Can Numbuh 1 stop a camp counselor without the help of 2 and 3? Probably not...

1x20 - Operation: T.O.M.M.Y.

February 7, 2003

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

1x21 - Operation: C.H.A.D.

February 7, 2003

Two parental villains are stupefying KND operatives around the world; an operative named Chad (Numbuh 274) enlists the help of Sector V.

1x22 - Operation: P.I.A.N.O.

February 21, 2003

Sector V tries to destroy all the pianos in a truck with a hamster that acts as Numbuh 4's replacement.

1x23 - Operation: Z.O.O.

February 21, 2003

Sector V is put into a "kids zoo" and must unite with the Delightful Children From Down The Lane and get all the other children out of their cages before lunch time to escape being fed to the zoo's cannibal bully.

1x24 - Operation: Q.U.I.E.T.

February 28, 2003

Numbuh 5 tries to keep the treehouse quiet so Numbuh 1 can sleep.

1x25 - Operation: R.A.I.N.B.O.W.S.

February 28, 2003

The boss of Rainbow Monkeys Inc. uses Numbuh 3 to find real Rainbow Monkeys for him.

1x26 - Operation: G.R.O.W.-U.P.

March 7, 2003

The Delightful Children from Down the Lane turn to Father for help, and the Kids Next Door are forced into a dangerous showdown.

Ben Diskin

Numbuh 1 (voice), Numbuh 1 (voice) / Numbuh 2 (voice), Numbuh 1 / Numbuh 2 (voice)

Sean Astin

Numbuh 2 (voice)

Lauren Tom

Numbuh 3 (voice)

Dee Bradley Baker

Numbuh 4 (voice)

Cree Summer

Numbuh 5 (voice)