During World War II, a human heart from a European laboratory (Dr. Frankenstein's) is transported to a Japanese lab, where it's exposed to Hiroshima's radiation after the bombing. The heart grows, mutates, and develops appendages, eventually growing into a full body and escaping.
Frankenstein vs. Baragon
In the final stages of World War II, the Nazis secretly transport the immortal heart of Frankenstein's monster to Japan, only to have it seemingly destroyed in the devastating bombing of Hiroshima. However, decades later, a feral child is discovered, born from the indestructible heart, spark...