There is an asteroid coming for earth and the boy out of lord of the rings is in it he sees the asteroid coming and tells everyone thr government have an underground base and decide to choose families to go under and if the familys get a call that mans they can go down the boy out of lord of the rings marries a girl so her family can go with them

Here you go: Deep Impact (1998) (http://www.imdb.com/title/tt0120647/)