some alien species had some sort of organic problem or something in their genetics, so they went to Earth a while back(1800s) and took organic samples of some of the organisms on earth to modify their own race. the DNA that they collected was mixed with their genetic code and there came many new forms of life on their planet. most of which could reproduce asexually. an animal cell variation is known as a Thernius. the animal cell organisms are Thernii or Therni. the Thernis still collect samples today.

Thernii pics:
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almost all Thernii are female and reproduce sexually and asexually as well as plantlife. the males, which are rare, are only able to reproduce sexually.

there are Thernis that chose not to be spliced with Earth genes. they are called Alpha Thernis. they naturally have tentacled forms [link]

most Alpha Thernis(not all) concider the splicing as corrupting their species. so they pretty much want to wipe out the new Thernis to keep their race "pure." the only ones that pose a real threat to the Alpha Thernis are the human-Therni hybrids. one in particular [link] happens to be the most notorious of them all. with the power of nothing in particular, this hybrid ended the threat that the Alphas posed...and he settles with the new Therni species because they are mostly hot humanoid babes. lol