Numbuh 275, real name Jacob, is a KND scientist who appeared in Operation: F.E.R.A.L.
He was based on a boy named Jacob whose wish through the Make-A-Wish Foundation
was to appear in an episode of Codename: Kids Next Door
He nodded to something Numbuh 71.562 said in Operation: F.E.R.A.L.
. He also had a few cameos in several other episodes. He is, to date, the most realistic-looking person in the show. He appeared alongside Numbuh 41
in Operation: G.I.R.L.F.R.I.E.N.D.
at the moonbase cafeteria. He is also seen in the final episode as one of the people wishing Nigel good luck.