Three years ago, alien robots invaded the earth, and after seven days of fighting, the earth was completely occupied. Since then, robots have been keeping a close watch on humans. They installed a positioning system on human heads and destroyed them once they detected that humans walked out of the house. In addition, aliens hired human traitors such as Robin (Ben Kingsley) to assist in management. Robin is obsessed with the beautiful woman Kate (Gillian Anderson), but Kate is only waiting for her missing husband to return. Robin claims that Kate's husband has been killed, but her son Sean (Callan McAuliffe) does not believe it, and the boy has never given up his efforts to find his father. One day, Sean accidentally discovered a way to disable the positioning system with his partners such as Connor (Milo Parker). The children tried to walk out of the house, and this incident also made it possible to overthrow the rule of robots...