Watch Thorobred for Free: How to Stream the Movie Online at 123Movies. . Helen Martin takes her father's place when he is too ill to carry out his duties as Sheriff, and followed by Jim Grey, tracks down Blackie Wells, notorious 'bad man,' who has shot up a town. The trail leads over prairie and woodland, ending when Helen assumes the part of a dancing girl in the Last Chance saloon and learns the hiding place of Blackie and his associates.