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The StoryBots take a trip to the lymph node, where they speak to a white blood cell. They learn about the role that the white blood cells play in protecting a person's body against viruses.
George gets sick and learns about germs and the importance of rest
With the help of the white blood cells, the StoryBots find the ability to combat a virus.
Hank explains innate immune systems and how the signs that we may associate with sickness are actually be symptoms of your immune system working.
An alien has taken control of the ship, and the crew need to fight it. Spock explains the situation in terms of biology: the ship is the body, the crew are the blood cells, and the alien is the virus.