As other reviewers have noted, this is basically a re-edit of the cult classic 1977 documentary "Gizmo!" I have no idea whether or not this version was authorized by the original producers. The only advantage in watching this version over the original is that it includes perhaps 15 minutes of unusual newsreel footage that wasn't featured in "Gizmo!" However, the new narration, music, etc. really suffer in comparison and also the editors have removed some of the best and most interesting footage from the original documentary. I would definitely recommend seeking out "Gizmo!" if you can.