When aliens misinterpret video feeds of classic arcade games as a declaration of war, they attack the Earth in the form of the video games.
 
Not quite Game Over.
 
FUN FACT:  The movie's video game high scores are based on real scores. Sam Brenner's Pac-Man score of 3,333,360 is the highest attainable score for the game, first achieved by Billy Mitchell. A higher score is possible on the Namco Pac-Man Anniversary edition machines. Ludlow Lamonsoff's Centipede score of 16,389,548 is one point higher than the real-life marathon world record set by Jim Schneider. Eddie Plant's Donkey Kong score of 1,068,100 is 100 points higher than Hank Chien's former world record.