Green Grass of Wyoming

Thunderhead is a white stallion who has been stealing mares from local ranches, following in the hoofsteps of his great-grandsire the Albino. Ranchers like Beaver Greenway and Rob McLaughlin organize posses to hunt him because his repeated thefts threaten their breeding stock and livelihoods. The stallion has become a notorious problem across the Wyoming range.

Earlier in the film, Ken McLaughlin freed Thunderhead years before, creating a complex history between the stallion and the ranchers.

Ken McLaughlin previously freed Thunderhead, which is why he feels a personal responsibility to save the stallion when he causes trouble again. This past connection explains Ken's determination to rescue Thunderhead rather than let the ranchers kill him, and it creates a parallel to how Thunderhead ultimately returns to the ranch willingly.

Rob McLaughlin leads the search party and attempts to shoot Thunderhead because the stallion has stolen Crown Jewel, a valuable trotter that Ken purchased. The theft represents a significant financial loss and threatens the McLaughlins' racing ambitions. Rob sees eliminating the stallion as the only solution to end the ongoing problem with mare thefts.

Ken finds Thunderhead and Crown Jewel hiding nearby after the stallion escaped the roundup. Rather than forcing the stallion or using violence, Ken persuades Thunderhead to return to the ranch for good. This peaceful resolution demonstrates the bond Ken formed with the stallion years earlier and signals Thunderhead's willingness to trust him.

Crown Jewel, a trotter brought from elsewhere to race in Wyoming, develops altitude sickness because she is not accustomed to the high elevation of the Wyoming hills. A veterinarian explains that her lungs become congested from the thin air, and he recommends putting her down rather than risking further health complications.

Beaver Greenway argues against the veterinarian's recommendation to put Crown Jewel down and instead prescribes an old-fashioned remedy. His traditional treatment works, saving Crown Jewel's life. Greenway's decision reflects his experience with horses and his refusal to give up on a valuable animal, especially one carrying the future hopes of the ranch.

During the Ohio Governor's Cup harness race, Crown Jewel takes an early lead but breaks stride, which is a violation of racing rules. In harness racing, horses must maintain a specific gait; breaking stride results in automatic disqualification. This costs Ken and the McLaughlins the race despite Crown Jewel's promising start.

After the race, the McLaughlins learn that Crown Jewel is in foal and Thunderhead is the sire. This news is significant because it vindicates Crown Jewel's value despite her disqualification and fulfills the film's parallel romance theme between Thunderhead and Crown Jewel. The foal represents the continuation of Thunderhead's lineage and ensures the stallion's legacy continues safely at the ranch.

Beaver Greenway, a former sulky driver, decides to compete in the Ohio Governor's Cup with his own horse Sundance. He enters the race alongside Crown Jewel, creating a friendly competition between the two families. Greenway's experience as a driver gives him confidence, and his participation adds extra stakes to the race between the Greenway and McLaughlin families.

While Crown Jewel takes an early lead before breaking stride and getting disqualified, Greenway's horse Sundance maintains proper form throughout the race. Greenway's experience as a former sulky driver helps him guide Sundance to victory, winning the Governor's Cup despite the setback with Crown Jewel.

Ken McLaughlin and Carey Greenway, granddaughter of Beaver Greenway, develop a romance while working together on the ranch during Crown Jewel's illness and recovery. Their relationship parallels the love story between Thunderhead and Crown Jewel, bridging the generational and familial divide between the McLaughlin and Greenway families who had been at odds over the stallion.