The Chula are a humanoid sentient species which developed and adcanced spacefaring civilisation as of the twentieth century or before. They are known to have been participating in wars, having developed powerful medical nanogenes which could restore even dying or dead soldiers to action. Those nanogenes were usually carried in automated medical ships droppes on the battlefield from where they could start repairing the injured. Such as medical ship has been known to crash on Earth in London during WWII. The effects of the nangogenes were contained and the ship destroyed.
Notes: Although no Chula are seen, the pilot seat from one of their ships seen in the aforementionned episodes is clearly made for a humanoid.