Kaiju CO is a science company that works to create super soldiers via special radiation. This special radiation has the effect to, when eaten, to slowly turn the consumer into an anthropomorphic Kaiju (Kaiju form can vary in size, race, etc). Not all Kaijus are giant lizards some of them are different races of animals or insects. All the Kaiju super soldiers are as tall as you’d expect, which is why the lab is so damn huge with enough room for all the Kaijus and scientists.