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An avid marine biologist, Toru Yano and his son, Ken Yano were carrying out a dive when they both encountered an unusual tadpole-like creature which began to produce large amounts of sulfuric acid. He and his son both suffer scars from this, with Yano suffering a large scar on the left side of his face. After having their injuries treated, Ken named the creature Hedorah, and Toru began to investigate a specimen he managed to retrieve during the expedition. Later, his independent investigations into Hedorah's chemistry led to the discovery of its weakness, and he suggested the construction of two massive electrodes to be used against the pollution kaiju.