Experts investigate the abduction of Betty and Barney Hill; new evidence surfaces about abductee Travis Walton; there may be an earthly explanation for the Mothman.
New theories about the Mantell UFO incident are revealed; scientific evidence may explain a UFO encounter in Texas; experts investigate what really crashed into a Canadian harbor.
Experts investigate the mystery of the Bermuda Triangle; researchers seek answers about strange sightings in Massachusetts; a murderer may be responsible for a string of unexplained disappearances in Bennington, Vt.
A young recruit encounters aliens in the Nevada desert in the 1960s; he claims they were working with the US military and housed a spaceship in a secret hangar nearby.
In the summer of 1952, stories of U.S. Air Force jets chasing UFOs over the White House knock the Korean War off the front pages of newspapers; as rumors spread, President Harry S. Truman demands to know what was flying over his house.