There was a previously released documentary, under the A&E; label, titled "UFO's-The First Encounters"(still available) which is the exact same documentary with one notable difference. Leonard Nimoy narrates the A&E; version while the History Channel version (Ancient Aliens) is narrated by someone else (I believe it's the same person who does many History channel docs). Given the choice I'll take the Leonard Nimoy version everytime. Add the confusion with the triple use of the title "Ancient Aliens" for 3 completely different History Channel DVD's and this becomes an entirely useless release.Ancient Mysteries: UFOs - The First Encounters