The History Channel has come up with even more interesting tales & suppositions on the theory of earth-visiting aliens and there's even a British narrator. I'm not sure I'm convinced, and indeed I've read, elsewhere, credible explanations of some of the phenomena, which weren't touched upon within the programme (theories discredited by HC or would it simply not make good tv?), however I am fascinated by the topic and the series (as with series 1 & 2) is well-made by the HC and will stand repeat viewing.
I considered marking this down by a star because of the poor sound quality - the setting has to be quite low otherwise the sound blares or distorts at anything above a modest level. I've checked it's not the tv or dvd equipment, in fact series 1 & 2 have the same problem. Haven't experienced similar with other HC programmes, it seems to be peculiar to 'Ancient Aliens' - extra terrestrial interference perhaps.