Rage

It was the Pentagon's ultra-secret weapon -- silent and tasteless. Completely invisible and undetectable -- until it was much too late. Then it could take as little as a minute, or as much as a week before all vital functions disintegrated and you painfully expired. It was called Nerve Gas and 300 pounds of it had been accidentally dumped over Wyoming. Based on the screenplay from the movie directed by George C. Scott starring Richard Basehart and Martin Sheen.