Night of the Comet

A comet wipes out most of life on Earth, leaving two Valley Girls fighting against cannibal zombies and a sinister group of scientists.
Two girls from the Valley wake up to find that a passing comet has eradicated their world and left behind a mysterious red-dust and a pack of cannibal mutants. With the help of a friendly truck driver, the girls save the earth from a villainous "think tank," karate chop their way through flesh-eating zombies, and, of course, find time to go to the mall.