Twenty years after the US Air Force first started investigating UFOs, a selection of scientists and eyewitnesses are interviewed by ITV's World in Action team.
Edward Condon
Rex Heflin
J. Allen Hynek
James McDonald
Donald Menzel
Unacknowledged
The Age of Disclosure
The Bloody Hundredth
Déjà Vu
Earth vs. the Flying Saucers
Bob Lazar: Area 51 and Flying Saucers
Stargate: Continuum
The Phenomenon