AllMovie

Silent Western star Fred Thomson inaugurated his own production unit with this fine Western, which, in addition to the magnificent horse Silver King, also featured Thomson's pet bull Murro and frequent leading lady Hazel Keener. Veteran villain Frank S. Hagney plays Eagle Eye, an Indian who cross-breeds one of rancher Harbison's (Herbert Prior) prime cows with a bison. The creature, known as Diablo, spreads terror in the valley exactly as the evil Indian had hoped. The government sends heroic Dan Allen (Thomson) to investigate and, with Harbison's pretty daughter (Keener) by his side, Dan manages to prevent Diablo from hurting anyone else. Photoplay Magazine said at the time, "Fred Thomson and Silver King again prove that their Westerns are different."