Rubble lives in a caravan and works on a battery farm. Totally oblivious to the outside world, he spends his days disposing of the sick and injured chickens. But all the while he dreams of a life in the army — despite the fact his numerous applications have been rejected. Then one day a mysterious visitor arrives and sees Rubble's child-like naivety combined with an ability to kill without compunction. Soon Rubble finds himself involved in a murderous secret project, his only chance of escape is the help of the girl he has to kill.