Numbuh 91 is a decommissioning pilot and guard. She is partners with Numbuh 51. She also appears in Operation: C.L.O.S.E.T., staring at Sector V before they went into the closet. She additionally was the presumed wing man for Numbuh 51 in Operation: G.R.A.D.U.A.T.E.S., and was presumably a victim of the animalization ray.