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I, Robot is a 2004 American science fiction film directed by Alex Proyas and starring Will Smith, Bridget Moynahan, Alan Tudyk, and James Cromwell. It is based on the 1950 short story "Runaround" by Isaac Asimov and the short-story collection I, Robot. The film's plot revolves around a homicide detective (Smith) who must investigate a murder which he believes is the work of a robot.