Dai Kaiju > Gamera

Barugon, from the second Gamera film, the first in colour. Barugon has icy powers opposing Gamera's flames. Apparently this is a holdover from a story idea where Gamera fought an ice giant, perhaps inspired by the jötnar of Norse mythology. Was the rainbow also suggested by the Bifröst of Scandinavian epics? I leave it to scholars of daikaiju science to discuss.