The Destructively Nefarious Kids are the counterparts of the Kids Next Door who exist in a mirror universe where everything is the opposite of the way it's in the regular universe. They are seen in Operation: P.O.O.L. The Destructively Nefarious Kids are devoted to tormenting children everywhere and rule their world with an iron fist.
At the end of Operation: P.O.O.L., the DNK change their ways and help kids instead of punishing them. Negative Numbuh 4, the original DNK supreme leader, was also sentenced to the broccoli mines for his crimes against the Negaverse.
- Negative Numbuh 3 - Negative Sector V Leader
- Negative Numbuh 4 - DNK Surpreme Leader
- Negative Numbuh 5 - Negative Sector V Member
- Negative Numbuh 49(-Temporary) - Negative Sector V Member
- Negative Numbuh 86 - DNK Troops Leader
In contrast to the Kids Next Door, who use 2x4 Technology for their weapons and tree houses for bases, DNK have futuristic weapons and well-armed fortresses. Their armor pieces resemble the 2x4 tech, though. For example, Numbuh 86's helmet is adapted from strainer basket, while Negative Numbuh 86 has a real battle grade helmet. However, it still retains the basic shape. Some of the more generic KND troops have slide projectors as helmets that use the lenses for laser targeting. The negative troops use helmets of similar shape, but again, they're made out of battle grade material (and to further extend the Positive-Negative pun, the negative troops have one horizontal line instead of a normal crosshair, which represent a negative, or minus, symbol. The KND troops have a normal crosshair, which in comparison represents a positive, or plus, symbol). The DNK also have negative numbers for codenames in contrast to the KND who have mostly positive numbers for codenames.
- The DNK is a backwards spelling of KND.
- This is the only sector in which there is no Negative Numbuh 362, who was planned for the TV series, but never released.
- They're also similar to the DC Comics group, the Crime Syndicate of America, mirror universe counterparts of the Justice League of America.
- The logo has Negative Numbuh 4 in the middle and Negative Numbuh 1 on the far right, as opposed to the KND logo because Negative Numbuh 4 is the leader of the Destructively Nefarious Kids.
- Their computer voice is male instead of female (similar to how the ISS Enterprise in the Star Trek episode "Mirror Mirror" has a male voice instead of a female voice like the USS Enterprise), and the Technology name is on top than below.