Afraid that Earth can't survive a global natural Armageddon? It has before. This insightful Animal Planet program explores the phenomenon of mass extinction and planetary catastrophes, employing cutting-edge computer technology to re-create the prehistoric world and the animal species wiped out by gamma rays, asteroids, and other devastating events that rendered about 99.9 percent of all animal life that has ever existed utterly extinct. 168 min. Standard; Soundtrack: English.