William Lee is an exterminator who finds that his wife Joan is stealing his insecticide (pyrethrum) to Recreational drug use. When Lee is arrested by the police, he begins hallucinating because of "bug powder" exposure. He believes he is a secret agent with two handlers in the forms of a talking insectoid typewriter and an alien "Mugwump". The bug assigns him the mission of killing Joan. She is allegedly an agent of an organization called Interzone Incorporated. Lee dismisses the bug and its instructions and kills it. He returns home to find Joan having sex with Hank, one of his writer friends. Shortly afterwards, he accidentally kills her while attempting to shoot a drinking glass off her head in imitation of William Tell.