In a futuristic world, time travel has not yet been invented, but its existence is predicted in the coming decades. However, the dark underside of this new-found technology is revealed when the narrative follows Joe, a looper- a hired gun contracted to eliminate targets sent back in time by the mob. When Joe's future self is sent back in time, it sets off a conflict of interests and morals as he is faced with the task of killing the only person who knows his true identity.