Mexican laborer Pepe Quiroga finds his world turned upside down when Don Juan, a beloved white horse from the ranch where he works, is auctioned off to a boorish film industry bigwig and is promptly transported to California. Desperate to be reunited with the animal, Quiroga sets off on a madcap journey to Hollywood, where he must wade through a sea of celebrities -- including Frank Sinatra and Jimmy Durante -- in the course of his search for his equine friend.