Really, really good story. Slam-bang opening when Charles Aidman (who was great in this) stumbles into Randolph and Calhoun's office after seemingly hit by a car, but he is whacked out nuts, running around pounding on things like a drummer, until he sees himself in a mirror and says, "That's not my face!" As the men in the white coats haul him off, he begs Rex Randolph "Fine my face, Mister! Find my face!" Rex is shaken enough to check things out, and he finds out that yes, this man isn't who his ID says he is and he really is not wearing his own face. Rex convinces his partners that something has happened to this guy, and together they try to get things right for him.
Charles Aidman replaced Ross Martin in the Wild Wild West for a spell while Martin recovered from a heart attack, but this was a much better vehicle for him. Really good story, really good acting.