McKay discovers that they are up against a nanovirus — microscopic machines programmed to kill only humans.
Yep, that was the plot of "Stargate Atlantis" last weekend on the SciFi channel. I watched only a bit of it as I was channel surfing. I stayed around long enough to realize why it's taking so long to make a movie version of Michael Crichton's nano-horror novel "Prey." It's very difficult to make a full-fledged nanobot attack look convincing on camera. I had to laugh at the "Stargate Atlantis" cast flailing around at invisible bugs. It looked a bit like the old "Star Trek" camera tilt trick, when the bridge crew is tossed around in unison.