The WORST episodes of Codename: Kids Next Door

Every episode of Codename: Kids Next Door ever, ranked from worst to best by thousands of votes from fans of the show. The worst 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: 3/15/2025Network: Cartoon NetworkStatus: Ended
Operation: L.O.V.E.
star
6.46
13 votes

#1 - Operation: L.O.V.E.

Season 4 - Episode 19 - Aired 7/15/2005

Numbuh 3 stars in a romantic musical as the lead girl, but when Numbuh 4 interrupts the play, it becomes a real war on stage between the DCFDTL and the KND.

Operation: K.A.S.T.L.E.
star
6.69
13 votes

#2 - Operation: K.A.S.T.L.E.

Season 3 - Episode 12 - Aired 7/30/2004

Numbuh 3 is forced to be married to King Sandy (again) when she is at a Rainbow Monkey theme park, but the others will not believe her.

Watch Now:Apple TV
Operation: T.U.R.N.I.P.
star
6.83
53 votes

#3 - Operation: T.U.R.N.I.P.

Season 1 - Episode 7 - Aired 12/27/2002

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

Watch Now:Apple TV
Operation: C.A.N.N.O.N.
star
6.84
37 votes

#4 - Operation: C.A.N.N.O.N.

Season 1 - Episode 2 - Aired 12/6/2002

Numbuh 4 forces the other operatives to build a "clam cannon" when Numbuh 1 leaves.

Watch Now:Apple TV
Operation: S.P.A.N.K.
star
6.89
18 votes

#5 - Operation: S.P.A.N.K.

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

Count Spankulot joins the KND and turns from his evil ways.

Watch Now:Apple TV
Operation: U.N.C.O.O.L.
star
6.91
11 votes

#6 - Operation: U.N.C.O.O.L.

Season 3 - Episode 19 - Aired 10/29/2004

The KND try to find Numbuh 78 in a treehouse infested with Nerd Zombies.

Operation: C.A.R.A.M.E.L.
star
6.91
11 votes

#7 - Operation: C.A.R.A.M.E.L.

Season 6 - Episode 19 - Aired 11/16/2007

Heinrich uses a ritual involving sacred golden caramels to take away the qualities the Sector V operatives value the most (Numbuh 1's leadership, Numbuh 2's intellect, Numbuh 3's giddiness, Numbuh 4's toughness, and Numbuh 5's coolness). Numbuh 5 eventually teaches Heinrich that he needs to share his candy to revert to his original form, she is then seen leaving with a young blonde girl.

Operation: L.I.C.O.R.I.C.E.
star
6.92
38 votes

#8 - Operation: L.I.C.O.R.I.C.E.

Season 5 - Episode 20 - Aired 8/10/2006

Heinrich comes back, but this time needs to be saved by Numbuh 5 as she recruits Stickybeard and his band of candy pirates to help her rescue Heinrich from Black John Licorice and his pirates.

Operation: H.O.U.N.D.
star
6.93
14 votes

#9 - Operation: H.O.U.N.D.

Season 3 - Episode 23 - Aired 11/12/2004

Numbuh 5 comes face to face with a vicious dog who is always eating her homework.

Operation: J.E.W.E.L.S.
star
7.00
12 votes

#10 - Operation: J.E.W.E.L.S.

Season 3 - Episode 17 - Aired 8/13/2004

Numbuh 5 journeys to the exotic Al-Shugar Desert to recover her stolen candy, the Blurpleberry Supreme, and discovers she's not the only one searching for the powerful, mystical candy.

Operation: T.R.A.I.N.I.N.G.
star
7.00
16 votes

#11 - Operation: T.R.A.I.N.I.N.G.

Season 3 - Episode 8 - Aired 7/16/2004

Tommy, Sonia, and Lee find that the training simulations in the Arctic Base are real.

Watch Now:Apple TV
Operation: B.R.I.D.G.E.
star
7.00
13 votes

#12 - Operation: B.R.I.D.G.E.

Season 6 - Episode 9 - Aired 1/12/2007

Numbuh 20,000 and his Squid Squad work with Sector V to destroy the bridge leading into Le Sissie, a store in the mall that sells horrible back-to-school clothes for kids.

Watch Now:Apple TV
Operation: K.N.O.T.
star
7.00
10 votes

#13 - Operation: K.N.O.T.

Season 4 - Episode 15 - Aired 5/20/2005

Numbuh 1 battles a group of snake ties with an adult against them.

Operation: T.R.I.C.K.Y.
star
7.04
67 votes

#14 - Operation: T.R.I.C.K.Y.

Season 3 - Episode 18 - Aired 10/29/2004

Numbuh 4 tries to get his candy back from Stickybeard on Halloween.

Operation: T.A.P.I.O.C.A.
star
7.05
19 votes

#15 - Operation: T.A.P.I.O.C.A.

Season 2 - Episode 6 - Aired 10/17/2003

Numbuh 2's grandmother joins forces with her friends to locate a pudding supply, which was trapped between the surface of the treehouse.

Watch Now:Apple TV
Operation: P.O.I.N.T.
star
7.06
16 votes

#16 - Operation: P.O.I.N.T.

Season 1 - Episode 14 - Aired 1/17/2003

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.

Operation: D.I.A.P.E.R.
star
7.07
15 votes

#17 - Operation: D.I.A.P.E.R.

Season 5 - Episode 3 - Aired 9/25/2005

The KND go to rescue babies from the hospital to protect them from becoming automatic adults. Numbuh 5 thinks the others are insane and tries to bring them back, but the babies themselves have other plans.

Watch Now:Apple TV
Operation: M.E.S.S.A.G.E.
star
7.07
14 votes

#18 - Operation: M.E.S.S.A.G.E.

Season 6 - Episode 8 - Aired 1/5/2007

Numbuh 2 attempts to deliver the fourth grade president's message.

Watch Now:Apple TV
Operation: C.A.K.E.D.-T.W.O.
star
7.08
12 votes

#19 - Operation: C.A.K.E.D.-T.W.O.

Season 2 - Episode 19 - Aired 12/12/2003

The KND take it to the skies to stop the DCFDTL's birthday cake.

Operation: P.I.A.N.O.
star
7.11
19 votes

#20 - Operation: P.I.A.N.O.

Season 1 - Episode 22 - Aired 2/21/2003

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

Operation: C.A.B.L.E.-T.V.
star
7.11
45 votes

#21 - Operation: C.A.B.L.E.-T.V.

Season 1 - Episode 15 - Aired 1/24/2003

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

Operation: H.O.L.I.D.A.Y.
star
7.13
16 votes

#22 - Operation: H.O.L.I.D.A.Y.

Season 5 - Episode 12 - Aired 1/21/2006

Numbuhs 2 and 3 try to guide a plane full of hamsters. Meanwhile, Lizzie is jealous of a girl Numbuh 1 is hanging out with, and races over to try to keep Nigel from "dating" her.

Watch Now:Apple TV
Operation: C.A.K.E.D.-T.H.R.E.E.
star
7.13
40 votes

#23 - Operation: C.A.K.E.D.-T.H.R.E.E.

Season 3 - Episode 14 - Aired 8/6/2004

It is the DCFDTL's birthday once again, and as always, the KND go to rob their nemeses of their ever-delicious birthday cake. However, their plan to neutralize them by egging them goes wrong as chicks hatch from every single egg.

Operation: S.P.I.N.A.C.H.
star
7.13
15 votes

#24 - Operation: S.P.I.N.A.C.H.

Season 6 - Episode 7 - Aired 1/5/2007

Amerigo Vespinaccio tries to spread spinach throughout the school, and Sector V must stop him.

Watch Now:Apple TV
Operation: T.O.M.M.Y.
star
7.13
45 votes

#25 - Operation: T.O.M.M.Y.

Season 1 - Episode 20 - Aired 2/7/2003

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