Terraformar

Terraformars are evolved humanoid cockroaches who live on Mars. They possess immense strength and endurance and a normal human is no match for them. They also appear to be somewhat intelligent and have a natural hate for humans.

Personality
They still posses cerci and antenna from the original cockroaches. Under their carapace on their back, they have wings, which grants them the ability to fly. The Terraformars use oxygen from vents all over their body. They can burn amylose polysaccharides for a massive burst of energy. Like humans, the oxygen they need for basic life functions is absorbed through their lungs. Their central nervous system is unchanged, and the body is controlled by the Subesophageal Ganglion located in the chest, rather than the head. Due to this, a terraformar can still move even after being decapitated, as long as the Subesophagael Ganglion is intact and there is an open passage to the lungs.

History
Little more than 500 years ago, cockroaches together with some moss were sent on Mars, in order to start a Mars Terraforming Project. 500 years later, when the humans revisited Mars, they saw how much the cockroaches have evolved and now have a human like appearance. Due to their massive strength and numbers, they quickly eliminated all of BUGS1 crew. Due to an endless downpour of space radiation and -80C temperatures, this harsh environment has finally forced the cockroaches, who have not changed their shape in 3 hundred million years to evolve.