Astrophysicist Dr Allen Hynek is recruited by the US Air Force to work on a top-secret UFO investigation. Dr Hynek joins Captain Michael Quinn to look into the case of a military pilot and an alien craft.

Dr Hynek and Captain Quinn investigate the case of a woman and her two children in West Virginia, after they report witnessing a flying saucer crash.

Hynek and Quinn are called in to investigate when Lubbock's citizens witness a mysterious V-shaped craft in the sky.

A commercial airline's UFO encounter leads Hynek and Quinn to a program that involves ex-Nazi scientists in Huntsville.

Hynek and Quinn follow a series of clues that lead them to group of people claiming to have witnessed strange lights during combat.

Green fireballs almost cause a nuclear disaster during a weapons test, leading Hynek and Quinn on an investigation into the origins of the event.