The Electric Horseman (1979)

Robert Redford is Norman “Sonny” Steele, a five-time All-Around World Champion cowboy who, now past his prime and often boozed up, is flacking “Ranch Cereal” for giant corporation Ampco. Sonny, along with prize racehorse Rising Star, have been brought to Caesar’s Palace in Las Vegas to add sparkle to a corporate convention.

While there, Sonny becomes so offended by the treatment of the horse—it’s being drugged by Ampco employees so it can safely appear with a bunch of Las Vegas dancing girls—that he steals the horse and rides out of Caesar’s Palace (through the casino) and Las Vegas and into the wilderness (along with news reporter Alice “Hallie” Martin, played by Jane Fonda) to set the horse free.