Got another idea?Not sure if this has been done yet, but in 1954, a giant, radioactive reptilian beast appears in Japan and goes on a rampage...
Godzilla is far from the last monster to appear in Japan, not even the first if you include that time the Kamakura Buddha statue came to life and wandered around Japan in 1934, the incident spiking an uptick in Buddhisim in the country and a drop in the suicide rate.