This is one of my favorites of all time. I feel that the story has a few sub plots that make for great entertainment.For the hard core fan it has a ring of truth as to man's beginnings.I enjoyed the conflict between the GOV mindset and the learned of the day.The filming was first rate as to the plot's creepy feeling.Actors were chosen with the best results in mind.The alien effects left something to be desired even for that day and time.Music has a great deal to to do with the over all feeling and this was the best part of the movie.I could listen to it without the picture on the set.The end of some early movies leave you flat and wanting,this one does not!In the end the Prof.wins and man prevailes.