THEY CAME. THEY SHOPPED. THEY SAVED THE WORLD!
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.
Not exactly a Christmas movie, but it does take place around the holidays, if I remember correctly…