Plot Summary:Mulder and Scully investigate strange occurrences at a volcano site where at least one scientist has died. A robotic video showed the scientist lying dead at the bottom of a crater where temperatures have reached 130 degrees Celsius. They can then see a shadow cross the body. Once on the site, they find terrified survivors and what Mulder believes is an unknown silicon-based organism, the first of its kind. With different members of the team seemingly infected, Scully and Mulder quarantine the entire group until they know exactly what they are dealing with.