An astronomer picks up a meteor headed towards the Earth that is big enough to cause an extinction event. Then other characters are introduced. There's also a crooked cop that plans to kill the family of the policeman that turned him in. (A pretty much totally unnecessary storyline).
Other smaller meteors begin to hit the Earth. The one scientist that at first wouldn't listen to the one that found the asteroid coming towards Earth acts like he knows what's going on during a meeting. He wants to take credit for being the hero when he really doesn't know anything. The main scientist is killed by a hit-and-run drive, so his assistant tries to make her way from Mexico to Los Angeles alone with the information needed.
This is the only movie about meteors/asteroids that I have seen that has the good idea to show the military gathering in cities and rural areas with stinger missiles and patriot missiles to shoot down what meteors they can. Granted, they won't get every one, but every one they get means that much less death and damage.
There's lots of scenes of damage caused by the meteors.
They deal with what they think is it, but then it turns out an even bigger space rock is headed towards Earth.
That constitutes the first half of the film. What is odd that in the entire first half the problem seemed to be only the United States, that no other countries were being hit and none were involved in the U.S. missile launch against the asteroid. Yet at the very beginning of the second half we see other countries that have been hit by meteors and the damage they have done.
The second half of the asteroid is still coming. The professor's female assistant comes up with an idea that could still save the Earth, as long as she can survive long enough to get it to the proper people.
A rather good movie.