Set some time in the future after an army of robots from outer space has invaded and colonised Earth. The adults lost the war and now it's up to the kids to save the world. Robots rule the streets and the people are locked in their homes. Stepping outside risks being vaporised by a hulking Sentry or picked off by a lethal Sniper. Through the ruins of Britain a group of kids set out to join the Resistance. However apart from the robots themselves, they also have to deal with their old teacher who has become a robot collaborator.