We’ll take you back in time to 1976 in Philadelphia. The American Legion is having a conference at the Bellevue Stratford Hotel when horror strikes — a disease starts killing various attendees. The CDC launches a full-fledged field investigation to try and solve what is now known as one of the greatest medical mysteries of the 20th century. 

Plus, we dive head first into the football concussion debate, find out what happens when a doctor and a fashion designer join forces, and learn how to name a disease.