A comet is approaching the Earth, and all over California people are celebrating even though, as the narrator points out, the last time the comet passed was coincidental with the overnight extinction of the dinosaurs. Sisters Regina (Catherine Mary Stewart) and Samantha (Kelli Maroney)
for different reasons spend the night in steel-lined rooms and come out in the morning to find nothing left of humanity but piles of empty clothes and some fine red dust. Those taking the full effects of the comet's rays have evaporated, while those only partly exposed have been turned into
flesh-eating zombies. Together they make their way to a radio station that is still on the air...