Seems to be quite a few Sci-Fi fans on here so I thought I'd start a topic so all the fanatics can share their favorite books, movies, and TV series.
I'm big on the 1950s films. I love all things about The Body Snatchers. Plus the movie Puppet Masters starring Donald Sutherland which is based on Robert Heinlein's novel of the same name. I've yet to read it but its coming soon.
The War of the Worlds, The Martian Chronicles, Michael Crichton's novels The Andromeda Strain & Sphere, his films Runaway & Westworld both of which he directed are all great.
Plus Robin Cook's novels Coma, Invasion, Abduction and Chromosome Six are outstanding.