A dirty bomb goes off in Los Angeles, jamming freeways and spreading a toxic cloud.

The American software designers Sean and Ben travel to Moscow to sell their software to investors. However, their Swedish partner Skyler pulls a fast one on Sean and Ben, and they are out of the business. They go to a nightclub, where they meet American Natalie and Australian Anne and they flirt with the girls and see Skyler in the club. Out of the blue, the population is surprised by lights, which they mistake for natural phenomena. But soon, they learn that the lights are aliens invading Earth and using power supply to annihilate mankind. Sean, Ben, Natalie, Anne and Skyler hide in the kitchen and when they leave the place, they seek out survivors on the street. Are they the last people on Earth?