Last Days on Earth

How secure is our future? This eye-opening documentary -- which uses computer-generated imagery to illustrate an asteroid collision, black holes and worldwide plagues, among other threats -- explores seven scenarios that could spell the end of the world. Interviews with noted scientists examine the extent of preparations for these cataclysmic events and what's being done to save future generations from extinction.

Cast: Neil deGrasse Tyson, Michio Kaku, Stephen Hawking, Al Gore, Michael Rampino