第 5 集: NK細胞攻擊正常細胞，同時樹突狀細胞協助細菌對抗流感

NK Cell attacks Normal Cell for insulting the immune cells, but U-1146 defuses the situation. Dendritic Cell rescues the lactic acid bacterium that fell into the storm drain and cares for it. The small intestine gets attacked by influenza. The virus has mutated and are unaffected by the immune cells' attacks, causing NK Cell to collapse in despair. The lactic acid bacterium produces Polysaccharides that power up Dendritic Cell and help him produce Cytokines, portrayed as embarrassing photos that shock the immune cells and motivate them to become stronger and wipe out the virus. After bidding farewell to the bacterium, Normal Cell apologizes to U-1146 and gives him permission to take the last bacterium he has. NK Cell informs U-1146 that Cancer Cell has returned. (Source: Wikipedia)

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