All of the world's nuclear states fire intercontinental ballistic missiles at the comet but only succeed in breaking it into fragments.

Research scientist David Dmatti (Joe Lando) is asleep when his co-worker Mark calls him and requests urgent help.

Mark dies before David narrowly avoids a meteor shower that kills the paramedics and destroys his work site.

Afterwards, the United States government discovers that the comet carries a deadly pathogen that has contaminated Lake Mead and orders a quarantine.

On the way to Las Vegas, David finds and revives an unconscious young woman named Lynn (Cooper Harris) at a gas station.