Henry Brogan (Will Smith) has been a hired killer of the US government all his life. After long years in the service, he has discovered the darkest secrets of the system. With the idea of abandoning this job that has taken everything that could make him happy, Brogan is persecuted by a young and mysterious agent, who seems to be able to predict each and every one of his movements. Determined to stop this young man who intends to hunt him relentlessly, Brogan will discover that he is a clone of himself 30 years younger. He will begin a fight against himself and those who have created his double.