Wow! Brilliant writing, brilliant acting, and an imaginative concept. This ranks at the top.This is so unique because it sucked the viewer in and not only had a shock "for the ages" of an ending-but generally placed the blame on us.Outside of Patty Duke's performance in "The Miracle Worker" this was with most brilliant non verbal performance I've seen on TV or Screen.The most shocking element to this episode is that no one could see it coming even though there are clues all along if you are paying attention(most people don't).It certainly redefines the element of humanity based on your particular perspective. I know I haven't discussed the episode but outside of a one sentence description of the episode you can't really say any more without giving it away. There also may be a social commentary evolving from this episode but rather than ramble on all I can say is this is one Twilight Zone that can not be missed.