'"Correct! I've saved your life countless times!" --Lenny
Lenny (previously known as Numbuh 0.4) is the boy with the helmet and is a part of the Delightful Children From Down The Lane.
Like the rest of the Delightful Children, Lenny is most commonly seen wearing a blue school uniform with a gray badge, knee-high socks of the same color, and brown shoes, on top of a white dress shirt and red tie. He also wears a red football helmet with a thick white stripe down the front. When he isn't wearing his helmet, he's shown to have neatly combed dark brown hair and a large mouthbrace.
As observed from Operation: U.N.D.E.R.C.O.V.E.R., Lenny at first acts a bit cold toward Sector V, but seems to get more nervous as the episode progresses. Though in one scene, he makes a sarcastic remark to Cuppa Joe and then jumps at him, contrary to his usual jittery demeanor. However this attack fails, and he immediately reverts back to his more frequent disposition.
This may all be an act though, as he rejoins with the rest of the Delightful Children at the end of the episode.
It is revealed in Operation: Z.E.R.O. that the Delightful Children are the operatives of the legendary "lost sector" of the KND, Sector Z, with Lenny as Numbuh 0.4. Along with the rest of the sector, he was captured by Father and placed in the prototype Delightfulization Chamber, which had much stronger effects than intended, Eleventy Billion-fold in fact, and completely destroyed the children's individual identities, creating the hive mind that is the DCFDTL and destroying the unstable machine.
In Operation: U.N.D.E.R.C.O.V.E.R., Lenny is apparently revealed to be an undercover KND operative and leaves the Delightful Children to assist Sector V during their attack on the coffee rig, during which time he functions independently and acts like a normal kid. However, this is revealed to be a ruse, and Lenny returns to the Delightful Children towards the end of the episode. Even after this is revealed, Lenny alone is responsible for the error that causes the Delightful Children's defeat, for which the other four call him an idiot, which could mean he might be still against their plans.
See Delightful Children from Down the Lane's ultimate fate.
- Lenny was the first of the DCFDTL to have his name known to the audience, in Operation: U.N.D.E.R.C.O.V.E.R..
- Lenny and David are the only ones who are actually addressed by these names over the course of the series.
- Sector V does a perfect impersonation of the Delightful Children as seen in Operation: U.N.D.E.R.C.O.V.E.R. (to which Lenny comments, "Hey, you guys are good at this!"). This may be a reference to how Numbuhs 1, 4 & 5 are voiced by the same actors as the Delightful Children.
- In Operation: U.N.D.E.R.C.O.V.E.R., the password to the coffee rig is sheep, possibly because the Delightful Children act like sheep.
- At the beginning of the episode, Lenny removes his helmet revealing his braces, but at the end, they transform into a new helmet.