"You fool! You have no idea what you've just DONE!!!"
Numbuh 74.239 is a recurring KND scientist who is later revealed to be a member of the KND Splinter Cell.
HistoryHe first appeared in Operation: F.E.R.A.L., where he and Numbuh 71.562 try to cure an ape-ified Numbuh 1 and get into an argument about whether to use "Element L", which Numbuh 74.239 believes might cause him to remain feral forever. In this episode, it is stated that he is in the 4th grade while Numbuh 71.562 is in the 5th grade.
In the series finale, Operation: I.N.T.E.R.V.I.E.W.S., he is again revealed to be part of the KND Splinter Cell, which itself is a cover group for the Galactic KND. It is he who tells Numbuh 1 that he was selected to join the Galactic KND and fight the alleged "disease" of adulthood. In an earlier scene, he makes Father release Sector V by threatening to destroy his cake.
He also made a cameo in The Grim Adventures of the KND. When Mandy's M.A.N.D.R.O.B.O.T. shoots mustard instead of the supposed-to-be laser, it was revealed that the laser was sent to a KND Bratwurst Factory (Numbuh 74.239 is seen exclaiming, "Say, this laser cuts through bratwurst pretty nicely!")
Due to the recent G:KND (Spin Off Series) teaser, it has been revealed that Numbuh 74.239 is a tree like alien that has long lived on Earth, working for the G:KND in the ranks of the Earth based KND.