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Clark (Tom Welling) befriends a boy named Garrett Davis (James Kirk), whose brother, Vincent (Tahmoh Penikett), has just died of liver failure. Miraculously, however, Vincent suddenly shows up, very much alive. When Vincent's liver starts failing again, it becomes apparent that his temporary recuperation may have had something to do with Clark's blood cells. Unaware that Clark is not actually related to his earth father, Jonathan (John Schneider), the desperate Garrett straps a kryptonite bomb to himself and demands that Jonathan "donate" his own liver to the dying Vincent.