The second of actor George C. Scott's rare directorial efforts (his first being the 1970 television film The Andersonville Trial), this drama, produced at the height of the Vietnam War, was critical of the military's weapons testing. Scott stars as Dan Logan, a single father living with his teenage son Chris (Nicolas Beauvy) in Wyoming. On a camping trip, the Logans are sprayed with an experimental chemical by an Army helicopter. The biological weapon kills every animal in sight and puts Chris into a coma. Seeking medical attention, Dan is instead used as a guinea pig by an Army doctor, Major Holliford (Martin Sheen), who wants to observe the effects of the chemical agent on him. Separated from Chris, Dan realizes that his son has died and escapes from the facility where he's been held. Purchasing some dynamite, the dying father goes on a campaign of bitter, bloody revenge against the Army and lab that made the dangerous substance.