The Perimeter Patrol is responsible for patrolling the planets on the outer perimeter of our solar system. These planets are literally the "outermost" planets. The Perimeter Patrol is based on the planet, Rondos. Its logo is a backwards letter "P" next to a regular letter "P". In a later story, the backward and forward "P" are replaced with a vertical line surmounted with an oval shape to suggest the joining of the backward and regular "P"s.