GodzillaOne-Two was a Godzilla-like creature that came into existence as a result of tests to create the ultimate Godzilla. Most of these creatures eventually died, leaving GodzillaOne-Two and GodzillaZero-One as the only two known to still be alive.
Believing that someone was out to kill the Godzilla test creatures, GodzillaOne-Two stayed low for most of his life and kept himself out of the public eye. However, GodzillaZero-One soon discovered him when a short CCTV clip surfaced online revealing GodzillaOne-Two as certainly being alive. GodzillaZero-One tracked him down and they got into a long fight. GodzillaZero-One won the fight and allowed his counterpart to escape so that he could once again stay low.