AllMovie

Universal's infamously obstreperous equine star, Rex the Wonder Horse, earned top-billing over leading man Jack Perrin in this, one of the studio's final silent Westerns. Rex plays the "World's Greatest Trained Horse" and is the star attraction of the Carney Carnival and Road Show. The show's new proprietor, crooked sportsman Martin Trask (Tom London), mistakenly assumes that he has full ownership of not only the horse but also his rider, lovely equestrienne Mademoiselle Estrella (Helen Foster). Rex and Estrella -- who is really an American girl named Margie -- seek shelter with young cowboy Jack Merritt (Perrin). In retaliation, Trask cancels Merritt's mortgage and blackmails Margie to leave with him. The evil showman then attempts to force himself on the girl, but she is rescued in the nick of time by Jack, Rex and Jack's horse Starlight. The Harvest of Hate was helmed by Universal's longtime head of serial and Western production, Henry MacRae.