Numbuh 67 is an operative of Sector F. Numbuh 67 first appeared in Operation: C.H.A.D. as he and two other members of Sector F were seen flying away from Mega Mom & Destructo Dad, but his jet-pack was hit and, as a result, was immobilized by the threat along with his comrades but was later revived. He also appeared in Operation S.C.I.E.N.C.E. at the science convention.