The M Space hunter Nebula Aliens are an insectoid species looking much like human-sized cockroacheswhich developed sentience and civilisation after the fall of the previous owner of their homeworld disappeared, leaving behind a dying planet, long plagued by pollution. It remains unknown if those previous inhabitants left the planet or became extinct but they were said to have been much closer to humans than the insectoids are. It also remains unknowns if they themsleves developed space faring technology or if they inherited it from their predecessors .
The insectoids made a desperate attempt to invade Earth in the 1970ies, disgused as humans and using the alien monsters Gigan and King Ghidorah they controled via technoloigcal means but their attempt was thwarted by the earth mutant monsters Godzilla and Anguirus. They later formed a deal with the seatopian human subculture living under the earth and showed them how to control the Gigan cyborg but with as disastrous results. The exact nature of their deal remains unknown.