Calvin protests a USR robot could not possibly have killed Lanning, as the Three Laws would prevent it. Suddenly, an NS-5 robot, USR's latest model, attacks them and flees. Spooner and Calvin track the robot to another USR facility, where the police are able to corner and apprehend it. They discover the robot, who prefers to be called Sonny, is not a standard NS-5, but was specially built by Lanning himself, with higher-grade materials as well as a secondary processing system that allows him to ignore the Three Laws. Sonny also appears to show emotion and claims to have "dreams," a notion Spooner openly mocks.