When Mama gets a call that Pop Pop has a fever, she begins to teach her son about germs, how they spread and ways to stay safe and healthy. Together, they learn new ways to have fun and see their friends and loved ones. Mama tucks him in and kisses his forehead as they reflect on their day. With one more forehead kiss, she sends her son off to dream land where he finds himself alongside Mama and an army of white blood cells ready to battle against the germs. "On Guard!" They shout.