02E10 - Grey Matters

When a patient of a mental institution is submitted to an intriguing brain surgery and is left behind with his brain exposed, he surprisingly regains sanity. The Fringe Division is assigned to investigate the case and while Olivia and Peter check the surveillance footage, Olivia recognizes one of the men. She check the FBI file and finds his name as Thomas Jerome Newton, the leader of the shapeshifters that have stolen the frozen heads. They discover that the patient's doctor is Dr. Paris and there are two other patients sent to other mental institutions by the physician fourteen years ago. Soon they learn that the two patients have mysteriously recovered and the Fringe Division discovers they have been also submitted to brain surgeries. When Walter is submitted to a CT-scan, they find that three pieces of his brain were removed and implanted in the three patients. What is the intention of Thomas?