As wartime fears peaked across the US during World War II, people throughout the nation were overwhelmed with fears of invading Nazis, secret biological weapons and more. For the residents of Mattoon, Illinois, these fears took a brief back seat to a new neighborhood menace -- a Mad Gasser who would sneak beside people's windows and pipe in a paralytic gas for reasons no one could understand. But who was this Mad Gasser? What on earth did this criminal want? Tune in to learn more.