Numbuh 100 briefly appeared in Operation: H.O.M.E., and Operation: M.A.U.R.I.C.E. He was mentioned in Operation: I.T. and Operation: W.H.I.T.E.H.O.U.S.E.. He is the first Supreme Leader known, leading the KND during their war against the Chicken Pox and being personally responsible for accepting Numbuhs 5, 1, 4, 2 and 3 into the organization. He was later succeeded by the famed Numbuh 274, and by his succession Numbuh 362, and Numbuh 5.
He was seen a well respected member of the KND, with the renowned Numbuh 1 later stating that he had a natural talent for leadership, being one of the few who could actually handle the strenuous position. Numbuh 100 is currently decommissioned and speaks with a noticeable southwestern accent.
- Numbuh 100 greatly resembles The Steve in hair and clothing. Many fans theorize that he is The Steve, but older.
- It is unknown when Numbuh 100 was decommissioned, nor is it mentioned by any KND operative. Numbuh 100 is not mentioned in the series at all, during the present timeline.
- He was likely decommissioned after Numbuh 3 joined the Kids Next Door.
Short dialogue in Operation: M.A.U.R.I.C.E.
Numbuh 100: Report Numbuh 9
Numbuh 9: The trap worked sir, i've managed to obtain one of their weapons,but the teens were too strong for us, we may have lost Numbuh 8A and Numbuh 8B.
Numbuh 86: I'm afraid... They've been poxed sir.
Numbuh 100: (To Numbuh 9) Well, you did your best.
Numbuh 11: But we weren't good enough, were we?
Numbuh 100: I'm afraid not Numbuh 11. Kids everywhere will be forever vulnerable until we find teenagers' source of chicken pox.