第 4 集: Normal Cell 從 H. Pylori 手中救出細菌，並加入 U-1146 執行巡邏任務

"H. Pylori": Normal Cell, who dreams of saving someone like the immune cells do, finds four cute and tiny bacteria and keeps them as pets. AE3083 delivers oxygen to him while U-1146 detects the bacteria and confiscates them for future disposal just as he is called to the stomach. Normal Cell follows him, worried about the bacteria. The stomach is being attacked by H. Pylori. When Normal Cell saves the bacteria from falling debris, one of them beats up the H. Pylori, allowing U-1146 to kill it. U-1146 realizes that they are Lactic acid bacteria, benevolent to the body. The one that fought stays in the stomach while the others stay with Normal Cell. U-1146 thanks Normal Cell and invites him to join him on patrol. "Antigenic Shift": U-1146 and Normal Cell go to the small intestine, which is overloaded with Purine, but one of the lactic acid bacteria consumes it before deciding to stay there. Later, Normal Cell accidentally drops one of the remaining two into a storm drain. U-1146 sadly remarks that he has no authority over the immune response so he can't tell the other immune cells not to attack that bacterium if they mistake it for hostile, reducing Normal Cell to tears as he insults the immune cells for being heartless. Just then, NK Cell arrives. (Source: Wikipedia)

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