A secretive research company has developed a miracle drug, only to learn that every miracle has its price. Delta Green agents may be the ones to pay it. Delta Green: Extremophilia brings the agents to Helena, Montana, where people are going insane and dying of a bizarre fungal infection. But this is no fungus that ever evolved on Earth. It’s something far older, far stranger, and far more dangerous. Can the agents stop the spread of this terrifying threat? Or will they become just another vector for the disease? Gather your players. Horror, suspense, intrigue, death, and strange wonders await.