This episode inroduces us to three very different familes starting at the end of WWII. Throughout this first episode we discover who they are and what they do. We then see the Roswell crash and a piece of metal is found which I'm thinking becomes a pivitol item throughout the series and somehow will tie the members of these three families together.
This first episode also shows the formation of Area 51 (if such a place truely exsists :-) ) In general this was a great piece of television that grabbed my imagination and held onto it until the very end. As cheesy as this sounds, I was taken by this episode.