By SOPHFRONIA SCOTT/Reported by Wendy Cole

He's best known for being on the Starship Enterprise, so what was Captain Kirk doing last week on a horse? Spectators at the National Horse Show cheered when actor William Shatner snagged a blue ribbon in the Saddlebred Five-Gaited class, in which horses are judged on styles of motion. Since retiring from the Star Trek series, Shatner has been breeding horses. His mount was named Time Machine, but it has naught to do with his TV days, save one link. Says Shatner: "Star Trek bought me the horses."