At a pharmaceutical plant, Banba and Kimura talk while descending into a large underground lab. They speak of the origin of the shadow monsters, created by ancient warring tribes to bring peace. The first monster destroyed the two originating tribes. Though it is now gone, its cells remain, infecting animals of all sorts in the modern world. These infected animal become new monsters dubbed Kagewani. In the lab the two men see a newly-produced clone shadow monster, an offspring from the sewer monster seen before, and the part-plant young man from an earlier episode. The escaping sewer monster gores Banba, frightening Kimura into running alone into the lab's safety cell.