Man on vacation is exposed to radioactive cloud and begins shrinking. What starts off as an embarassing predicament turns into metaphysical horror, as he continues to shrink and shrink...
One of the best science fiction films of the 1950s, with a smart, poetically tinged script from Richard Matheson, and fine performances fro mthe whole cast, especially Williams. Also the best human-spider fight ever filmed (sorry, Shelob).
"All this vast majesty of creation, it had to mean something. And then I meant something, too. Yes, smaller than the smallest, I meant something, too. To God, there is no zero. I still exist!" Probably my favorite last lines of any film. RIP, Richard--you are legend.