The Nox Virus gets released. We find out how an epidemic starts.

Now that we've created a zombie pathogen called the Nox virus, it's time we released that sucker into the world. We'll explore some caves in the Yukon, jump off the roof of the most luxurious hotel in Philly, and party in the emergency room. Also, does the country have an immune system? Yes, and some of them wear plastic suits.