When a bespectacled stranger shows up at the Z-Bar Ranch asking to borrow a horse, the cowboys think they'll have some fun. They offer him the Zebra Dun, the meanest, wildest, most ornery horse around. But this newcomer not only rides the Zebra Dun with ease, he also out-wrangles every other hand on the ranch-- proving that every educated fellow's not a plumb greenhorn.