Numbuh Infinity is one of the minor characters of the cartoon series Codename: Kids Next Door. He is secretly part of Galactic Kids Next Door team which he disguises as a kid.
He is also serves as the ambassador of the Kids Next Door, prior to having an agreement with the teenagers that they will no longer bullying kids again. However it was been failed due to the reason that it is a trap all along (which Chad knew all along).
Apparently, he only appears on the episode Operation: T.R.E.A.T.Y.