Green Grass of Wyoming 1948

Beaver Greenway, Charles Coburn, is furious when Thunderhead, the white stallion that Ken McLaughlin Robert Arthur freed years earlier, steals another of his mares. Rob McLaughlin, Lloyd Nolan, organizes other ranchers to hunt Thunderhead, who, like his great-grandsire the Albino before him, has taken mares from local ranches. Meanwhile, Ken McLaughlin returns from a horse-selling trip with profits that he uses to buy Crown Jewel, a trotter, and though Rob is skeptical at first, he eventually agrees to train the mare for harness racing. One night, Thunderhead appears again and runs off with Crown Jewel. The next day, Rob leads a search party to locate them and shoots Thunderhead, though Ken is determined to save him. They locate and round up Thunderhead’s herd, but the stallion and Crown Jewel escape. Ken finds the pair hiding nearby and persuades Thunderhead to return to the ranch for good.

When Crown Jewel develops altitude sickness from living in the Wyoming hills, a veterinarian, Charles Tannen, warns that her lungs are congested and suggests putting her down; Greenway instead prescribes an old-fashioned remedy that works. Meanwhile, Ken and Greenway’s granddaughter Carey Greenway, Peggy Cummins, develop a romance.

Crown Jewel, fully recovered and trained, is entered in the Ohio Governor’s Cup sweepstakes. Greenway, a former sulky driver, competes with his own horse, Sundance. Ken drives Crown Jewel, who is leading, but she breaks stride during the race, disqualifying them. Greenway and Sundance win. The McLaughlins remain proud of Crown Jewel’s effort, especially upon learning she is in foal and Thunderhead is the sire.