In Theaters July 31, 2009

Kids on a family vacation must fight off an attack by knee-high alien invaders with world-destroying ambitions. At the same time, the youngsters work hard to keep their parents in the dark about the battle upstairs.

It's the Pearsons versus the aliens who "came from upstairs," in an all-out battle that will decide the fate of the Earth—and kick-off the ultimate summer vacation.