In this episode, 30-year-old Dan and 39-year-old Laura must undergo surgery while remaining awake, allowing the surgeons to map the functioning of their brains. For Dan and Laura and their families, the question remains: will they be the same people after the surgery is completed? Detailed computer-generated graphics animating the MRI scans reveal how the specific functions of the patients' brains have been affected, casting new light on the mysteries and marvels of the brain.