Evolutionarily, pain exists to warn of potentially harmful and dangerous things in the environment, allowing us and other creatures to learn, respond and ultimately survive. Pain also triggers an emotional response in humans, which links the physical and the emotional experience in ways that are difficult to tease apart, though it does seem that empathy is one result of the emotional component of pain. For decades, scientists and researchers have constructed computers to mimic human neural networks. Recently, some advanced robots have been designed with self-preservation mechanisms that vaguely replicate a pain response. So to what extent should robots share in human pain? Combining interviews with experts from the University of Cambridge and elsewhere, together with clips from amusingly relevant science-fiction films and TV shows, Pain in the Machine explores whether there is a sense in which robots could come to experience pain, and probes the practical and ethical implications of equipping the next generation of robots with such a capacity.