This episode tests two theories that try to explain why TWA Flight 800 exploded shortly after takeoff from JFK International Airport in New York. Was it terrorism, a mechanical failure or a problem with the fuel tank?

Experts give their opinion on the existence of Bigfoot. Also, this episode gives a frame-by-frame analysis of footage of an actor in a Bigfoot costume. Reports of Bigfoot sightings date back to 1839. Scientists examine footprints and hair samples to determine if there is a possibility of Bigfoot being real. Several eyewitnesses tell their stories of Bigfoot sightings.

This episode examines the controversy around Project Mogul, radar balloons and what happened in Roswell, New Mexico.

This episode examines whether John Wayne's cancer was caused by cigarette smoking or from being on a radioactive movie set.

This episode investigates jet-aircraft vapor trails to find out whether they are composed of carbon and water-vapor exhaust or toxic chemicals.

The enigmatic phenomenon that happens to many cattle is investigated.

This episode will examine if near-death experiences (NDEs) are a window into the afterlife and how science can confirm or invalidate these experiences.

Some who claim to have been abducted by aliens have been found to have an object embedded in their bodies. This episode tests "alien implants" that have been removed from alleged abductees to see if they are man made or from another planet.