The race begins when a Zook named VanItch slingshots the Yook patrolman's (Grandpa in his younger years) "Tough-Tufted Prickly Snick-Berry Switch" (a switch-esque truncheon with prickly burrs). The Yooks then develop a machine with three slingshots interlinked, called a "Triple-Sling Jigger". This works once; but the next day VanItch counterattacks with his own creation: The "Jigger-Rock Snatchem", a machine with three nets to fling the rocks fired by the Triple-Sling Jigger back to the Yooks' side. Every time the patrolman is defeated, he reports this to the Chief Yookeroo, who tells him not to worry ("My Bright Boys are thinking"), and three intelligent Yooks are shown drafting plans for a more modern weapon.