I'm surprised that there are a few of these that I don't remember.
King Nine was the one that seriously threw me, until I read the summary.
I knew all of those right off the bat except X (The Brain Center at Whipple's).
Years and years of Halloween Twilight Zone marathons on KOFY TV20 and there was one I still hadn't seen. Maybe I just don't remember, but the synopsis didn't seem familiar.
Note to self; do not check flist before you go to bed.
And do not sleep.