"Operation: F.U.T.U.R.E." "F.U.T.U.R.E." stands for "Female's Utopian Trap Unleashes Reprehensible Evil." Numbuh 4 is sent to Rita's Preparatory School where Rita tries to turn him into a girl. What Numbuh 4 uncovers is a plot by little girls to take over the world.
"Operation: A.F.L.O.A.T." "A.F.L.O.A.T." stands for "Agents Feared Lost On Awful Tide." The Kids Next Door fall into a sea of asparagus after escaping all of their worst villains.
"Operation U.T.O.P.I.A." "U.T.O.P.I.A." stands for "Uncovering The Only Perfect Island Accidentally." Numbuh 1 gets kidnapped by a villain who makes him think that he has found a children-only island.
"Operation: F.O.U.N.T.A.I.N." "F.O.U.N.T.A.I.N." stands for "Figure Out Unusual Nerd's Tantalizing And Impossible Necessity." "Leaky" Leona is kidnapped by the Delightful Children Down The Lane and taken to an ancient school buried beneath their own. The Kids Next Door follow and have to survive multiple booby traps to rescue her and get her back to the fountain of youth.
"Operation: B.U.T.T." "B.U.T.T." stands for "Blackmail Uncovers Titanic Tush." Numbuh 1 is forced to take a day off at the beach only to end up without his shorts when a crab steals them.
"Operation: A.R.C.H.I.V.E." "A.R.C.H.I.V.E." stands for "Ancient Recorded Children's History Is Very Enlightening." A look into the files of the Kids Next Doors reveals how children created adults, and how everything went wrong.
"Operation: P.I.N.K.E.Y.E." "P.I.N.K.E.Y.E." stands for "Private Investigator's New Kase Extra Yucky Epidemic." Numbuh 2 and the hall monitor find Numbuh 86 has been attacked by water balloons containing pink eye.
"Operation G.R.A.D.U.A.T.E.S." "G.R.A.D.U.A.T.E.S." stands for "Gargantuan Ray's Advance Decimates Unprepared And Terrified Escaping Soldiers." At the Kids Next Door Cadets' Graduation, Numbah 2's brother Tommy is initiated into the organization as Numbah T.
"Operation C.A.K.E.D.-T.H.R.E.E." "C.A.K.E.D.-T.H.R.E.E." stands for "Commandos Attempt Kapturing Enemy's Dessert - They Have Real Extreme Eggravation.
"Operation: H.U.G.S." "H.U.G.S." stands for "Humongously Unwieldy Gorilla Showdown." Numbah 4 finds himself stuck in a Rainbow Monkey amusement park with Numbah 3.