In "Operation: R.E.C.E.S.S. (Recreation Ended 'Cuz Enemies Savor Salad)", salad oil is discovered under the playground at Gallagher Elementary. Principal Sauerbraten takes advantage of this find, making students work to pump the oil out during recess so it can be marketed. The Kids Next Door plan to strike back, but their plans interfere with the date Numbuh 1 promised his girlfriend, Lizzie. In "Operation: H.A.M.S.T.E.R. (Hungry Archenemy Meowers Strike To Entrap Rodents)", while the Kids Next Door go off on their mission to save recess, the hamsters of the Treehouse are attacked by the Delightful Children From Down the Lane's cats, the Insidious Felines From Atop the Litterbox. Slapstick comedy in the style of a certain famous cat and mouse team ensues.