Abigail "Abby" (Gilligan) Lincoln a.k.a. Numbuh 5 is the intelligent, relaxed girl second-in-command/spy in Sector V. She
became a KND operative three years before the show started as shown in Operation: M.A.U.R.I.C.E.. She was trained by her older sister, Cree (Numbuh 11), and joined her sister, Numbuhs 8a and 8b, and Numbuh 9 in Sector V.
After Cree betrayed and was defected from the KND, Numbuh 5 became the leader of Sector V, until she allowed Numbuh 1 to take over after she found and hacked his grades for his KND Entrance Exam. She is the oldest member of Sector V. Numbuh 5 later became Supreme Leader after Numbuh 362 retired.
