Dr. Yuzo Kawaji was a scientist in Hiroshima who worked under Dr. James Bowen in his studies about radiation poisoning. When they discovered a boy who had absorbed massive amounts of radiation as a result of the Hiroshima bombings but had not died, they were intrigued and wondered if the child might have grown from the disembodied but still living heart of Dr. Victor Frankenstein's monster. A former Japanese naval officer named Kawai imparted this information to the doctors.