The final episode chronicles 15 recent years in the history of blood, assessing the current state of its safety and posing compelling questions about its future. "New Blood" spotlights scientists searching for reliable safety measures; plaintiffs and defendants settling blood-related AIDS lawsuits in the U.S., Europe, and Japan; the growing fear of mad cow disease; and the status of blood safety in developing nations like India compared to the United States. The show travels back to look at the earliest known transfusion -- between a calf and a mentally ill Frenchman -- and moves forward to focus on the costly effort now underway to produce artificial blood.