Night of the Comet (1984) 

Two pretty high school girls (one a cheerleader!) don't like their stepmother or her new boyfriend ("Daddy would have gotten us Uzis!"). One morning, they wake up to find that everybody in Los Angeles has been turned to dust by a Comet except them, a guy who looks like Erik Estrada, some zombies and the occupants of a secret underground government installation. - IMDb

 

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