Spiro T. Agnew Middle School is the school where the students from Third Street School go after they finish sixth grade. It is named for Spiro T. Agnew, the first Vice President under President Richard Nixon. It was first mentioned in The Great Jungle Gym Standoff.
Principal Peter Prickly attempts to impress the school district's superintendent at various points throughout the series in an attempt to secure the job of principal there. Despite coming very close in "Prickly is Leaving," he ultimately did not get the job in the series. In another Disney series called Shorty McShorts' Shorts, one short features a school called Spiro Agnew Junior High, probably a reference to Recess.