Does anyone remember a TV event (special and not a series) that gave several scenarios on how extraterrestrials could decimate our species.

I don’t mean to sound negative,but it was such an interesting show and really it came out of nowhere. It may have aired about 5 years ago on a major network. One example that stayed with me was the release of giant tsunamis across the globe,wiping out most of world’s population. It seemed to be the most effective way to get rid of us, if that is their intent. Also, I’m not ready to move to the Midwest.