"Strep throat! Hay fever! Influenza! The world is a dangerous place for a red blood cell just trying to get her deliveries finished. Fortunately, she's not alone... she's got a whole human body's worth of cells ready to help out! The mysterious white blood cell, the buff and brash killer T cell, the nerdy neuron, even the cute little platelets -- everyone's got to come together if they want to keep you healthy!"--Amazon.com.

The world is a dangerous place for a red blood cell just trying to get her deliveries finished. In this episode ... "To fight on the front lines of the immune system, hardworking cells must undergo intense training. Killer T Cell and Helper T Cell are the best of the best now, but back in their academy days they were nothing more than little cells with big dreams and an even bigger rivalry. Meanwhile, some of the trickiest problems turn out to be...

Life's not easy for a workaday cell, and amid all the hustle and bustle it takes to keep the human body going, it can be hard to know who's an enemy and who's a friend. You might think all germs are bad, but it turns out some bacteria aren't just friendly, they're downright essential (not to mention cuddly)! In fact, when an old nemesis returns, it might just be those friendly, cuddly bacteria that help save the day. The saga of life inside you continues!...