"Red Blood Cell and White Blood Cell somehow keep running into each other--could their bond have been fated since childhood? Either way, the body they live and work in can't seem to catch a break. From food poisoning to heat exhaustion to the threat of cancer, life in the body is as busy as it is dangerous, but the hard-working cells that keep it (and you) running are up to the task!"--Back cover.

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...