This last film by former silent great Tom Mix ,is a mixture of western/science fiction.Production values are good by Mascot standards,chapter endings are ,for the most part satisfactory,but continuity is sometimes confusing,making the serial drag in spots.Mix is doubled in many of the scenes,but is otherwise satisfactory.Charles Middleton is good as the head villian,likewise,Jason Robards as his aide. Summary;Takes a long time to unfold,but an ok effort from Mascot Pictures.