Lucy is set in a world that is run by the mob, street gangs, drug addicts, and corrupt cops. Lucy (Scarlett Johansson), a woman living in Taipei, Taiwan, is forced to work as a drug mule for the mob. The drug implanted in her body inadvertently leaks into her system, changing her into a superhuman, due to accessing much more than the normal 10% of her brain capacity. She can absorb knowledge instantaneously, is able to move objects with her mind, and cannot feel pain and other discomforts.