The BEST episodes of Codename: Kids Next Door

Every episode of Codename: Kids Next Door ever, ranked from best to worst by thousands of votes from fans of the show. The best episodes of Codename: Kids Next Door!

The objective of Codename: Kids Next Door is simple--to lead young people everywhere in the fight against the injustices of a not-so-kid-friendly world! From the fortress of their treehouse headquarters, this covert team of 10-year-olds uses their patented 2x4 technology to put a stop to anyone who gets in the way of their mission. So hurry and join the KND revolution.

Last Updated: 6/10/2025Network: Cartoon NetworkStatus: Ended
Operation: C.A.T.S.
star
9.04
51 votes

#1 - Operation: C.A.T.S.

Season 2 - Episode 1 - Aired 10/3/2003

Numbuh 4 is mistaken for a cat by an old lady after being stuffed in a kitty costume from his dispute with Numbuh 3.

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Operation: F.A.S.T.-F.O.O.D.
star
8.68
19 votes

#2 - Operation: F.A.S.T.-F.O.O.D.

Season 2 - Episode 8 - Aired 10/24/2003

Numbuh 3 is sent on a mission for her birthday: to get a fast food meal. The restaurant is later revealed to actually be for sharks, with kids being murdered for food.

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Operation: M.U.N.C.H.I.E.S.
star
8.62
13 votes

#3 - Operation: M.U.N.C.H.I.E.S.

Season 4 - Episode 14 - Aired 5/13/2005

The KND have run out of Rainbow Munchies, their favorite cereal, so they send out tennis-ball probes to find a box. They find it in Aisle Number 60-teen at the Supervillains Supermarket & Deli, but it is the last one the store has, and it is as popular with the bad guys as it is with the KND!

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Operation: L.I.C.E.
star
8.38
55 votes

#4 - Operation: L.I.C.E.

Season 1 - Episode 11 - Aired 1/10/2003

The Delightful Children from Down the Lane attack Sector V's headquarters with an infestation of hair-eating lice.

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Operation: S.U.P.P.O.R.T.
star
8.38
21 votes

#5 - Operation: S.U.P.P.O.R.T.

Season 2 - Episode 5 - Aired 10/17/2003

Numbuhs 2 and 1 try to find out about Cree's B.R.A. (Battle Ready Armor).

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Operation: T.R.I.C.Y.C.L.E.
star
8.31
16 votes

#6 - Operation: T.R.I.C.Y.C.L.E.

Season 6 - Episode 11 - Aired 1/19/2007

Tommy loves Numbuh 2's cruddy, old tricycle but gets laughed at when the other kids see him riding it. Using his 2x4 technology expertise, Tommy rebuilds it into the "Best Bike in the Whole World", but the bike turns evil trying to impress Numbuh 2.

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Operation: A.R.C.H.I.V.E.
star
8.25
16 votes

#7 - Operation: A.R.C.H.I.V.E.

Season 3 - Episode 9 - Aired 7/23/2004

An archive is shown of the origin and story creation of adults, and their rebellion of children. Numbuh 1 narrates on how adults were created, how they took control, and families were made.

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Operation: G.I.R.L.F.R.I.E.N.D.
star
8.23
13 votes

#8 - Operation: G.I.R.L.F.R.I.E.N.D.

Season 6 - Episode 18 - Aired 11/9/2007

Lizzie has always had to compete with the Kids Next Door for Nigel's attention, and she thinks Nigel has found a new girlfriend.

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Operation: T.R.I.P.
star
8.15
13 votes

#9 - Operation: T.R.I.P.

Season 2 - Episode 24 - Aired 5/28/2004

Numbuh 3 is followed by the ITFBTM (Interesting Twins from Beneath the Mountain), the cousins of the DCFDTL, when she goes to Japan, so they can infiltrate the Japanese KND headquarters.

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Operation: D.O.G.F.I.G.H.T.
star
8.14
14 votes

#10 - Operation: D.O.G.F.I.G.H.T.

Season 2 - Episode 23 - Aired 5/28/2004

Numbuh 2 is shot out of the sky by another pilot countless times, who he thinks is a threat.

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Operation: B.U.L.L.I.E.S.
star
8.09
44 votes

#11 - Operation: B.U.L.L.I.E.S.

Season 5 - Episode 4 - Aired 10/21/2005

Numbuhs 2 and 4 try to escape from an island inhabited by bully monsters.

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Operation: U.T.O.P.I.A.
star
8.06
17 votes

#12 - Operation: U.T.O.P.I.A.

Season 3 - Episode 4 - Aired 6/25/2004

Numbuh 1 discovers an island paradise populated by kids. Numbuh 1 finds a perfect island, with much candy, fun and no adults. However, he deduces something unusual is happening and has to do with Chester's Happy Headband.

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Operation: D.A.T.E.
star
8.00
20 votes

#13 - Operation: D.A.T.E.

Season 2 - Episode 4 - Aired 10/10/2003

The KND and nearly every kid in town are invited to a dance at the DCFDTL's mansion. However, it was actually a trap, all the party guests (except Numbuh 1 and Lizzie) are "delightfulized" like the DCFDTL.

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Operation: P.I.N.K.E.Y.E.
star
8.00
18 votes

#14 - Operation: P.I.N.K.E.Y.E.

Season 3 - Episode 11 - Aired 7/30/2004

Numbuh 2 investigates a pink eye outbreak in Gallagher Elementary in a noir style. An epidemic of conjunctivitis (pink-eye) has taken several victims. Numbuh 2 must investigate if the cases are coincidental or if a certain nurse is causing them.

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Operation: C.R.I.M.E.
star
8.00
15 votes

#15 - Operation: C.R.I.M.E.

Season 6 - Episode 12 - Aired 1/26/2007

When Gallagher Elementary students are being arrested by the School Safety Patrol for crimes they are envisioned to commit, including detective Numbuh 2, leaving Numbuh 3 to investigate a psychic member of the School Safety Patrol while trying to finish her social studies homework.

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Operation: H.A.M.S.T.E.R.
star
8.00
17 votes

#16 - Operation: H.A.M.S.T.E.R.

Season 6 - Episode 5 - Aired 9/22/2006

While the team is off on their recess-rescuing mission, the hamsters are attacked and captured by the Sinister Felines from Atop the Litterbox, but end up battling the Hamsters Next Door.

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Operation: P.O.P.
star
7.96
23 votes

#17 - Operation: P.O.P.

Season 2 - Episode 2 - Aired 10/3/2003

The KND's soda pop is sought out by an evil industrialist. The legal age for drinking soda has been changed to Everyone 13+. Numbuh 2 is caught selling illegal soda at a local bar and discovers a conspiracy to bottle kids.

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Operation: K.I.S.S.
star
7.95
19 votes

#18 - Operation: K.I.S.S.

Season 2 - Episode 12 - Aired 11/7/2003

Numbuh 2 is turned into a teenager when an experiment goes horribly wrong, but gets smooth with Numbuh 5's older sister.

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Operation: B.U.T.T.
star
7.94
18 votes

#19 - Operation: B.U.T.T.

Season 3 - Episode 7 - Aired 7/16/2004

The DCFDTL plants Numbuh 1 from his swim trunks and get photos of his disproportionately huge buttocks. They black mail him with them.

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Operation: C.L.U.E.S.
star
7.94
16 votes

#20 - Operation: C.L.U.E.S.

Season 4 - Episode 4 - Aired 11/26/2004

Numbuh 3's family are invited to Numbuh 2's house, where Mrs. Gilligan is hoping to get a promotion out of this. It is later revealed that the Rainbow Monkey is stabbed by a fork.

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Operation: A.F.L.O.A.T.
star
7.94
16 votes

#21 - Operation: A.F.L.O.A.T.

Season 3 - Episode 2 - Aired 6/18/2004

The KND crashland into a sea of asparagus, and find out that they have more to worry about than staying afloat.

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Operation: P.R.E.S.I.D.E.N.T.
star
7.93
67 votes

#22 - Operation: P.R.E.S.I.D.E.N.T.

Season 3 - Episode 20 - Aired 11/5/2004

The KND try to get the Fourth Grade Class President to his Town Council meetings safely.

Directors: Tom Warburton
Writer: Mo Willems
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Operation: S.H.A.V.E.
star
7.90
20 votes

#23 - Operation: S.H.A.V.E.

Season 2 - Episode 9 - Aired 10/31/2003

The KND investigate why people are getting mustaches. They end up showdowning the "head mustache", but they're in for a surprise of who's to blame.

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Operation: M.A.U.R.I.C.E.
star
7.90
10 votes

#24 - Operation: M.A.U.R.I.C.E.

Season 4 - Episode 18 - Aired 7/8/2005

Maurice, a member of the Kids Next Door is decommissioned. Numbuh 5 is saddened by it, and suggests that they monitor Maurice to make sure the teenagers do not recruit him.

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Operation: M.O.V.I.E.
star
7.89
19 votes

#25 - Operation: M.O.V.I.E.

Season 2 - Episode 7 - Aired 10/24/2003

Numbuh 4 tries to sneak into an R-rated movie to find it is a secret villain meeting.

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