this film be too bad to be even be consider chlock . the main storyline show promise and originality but be severely corrupt by long and boring and irrelevant sub plot . grant that this be the late 70 and but the special effect be childish at best and keep in mind that this decade also produce star war . the only save grace be the amessage but sadly and it impact be overshadow by a bad production . at the end of this film you will be at one of two opinion while must buy the book because the plot be so original and they just ruin it by a bad film or i never do really understand the 70 . enjoy the very and very few good part and forget the rest .