Exomorph

The Exomorphs are a genetically engineered race of creatures that were developed by the ancient Idryll civilisation. They eventually went out of control and destroyed the ancient Idryll who managed to stop them but not before their empire collapsed and they were regressed into a pre-warp civilisation.

They were reawakened at the Master Control Facility by several Idryll who wished to return to their days of glory by using the genetically engineered creatures. However, they were not the only faction attempting to control the Exomorph's as Romulan's under the command of Suldok wished to take control of the creatures for their own purposes while a single Exomorph had grown sentient wished for his race's dominion of known space without a master. Finally, the Hazard team under the command of Alexander Munroe on the USS Enterprise E wished to stop the weapons from going out of control and succeeded in destroying the Exomorphs before they could threaten the Alpha Quadrant.

There were several different genetically made 'castes' of the creatures which utilised swarm tactics that were directed by the higher 'commander' castes. They were bio-genetically engineered to survive in any environment and were capable of moving through the vacuum of space without any protective clothing. Interestingly, they managed to adopt a form of impulse drive within their very bodies allowing them to navigate into space which made them a menace beyond their homeworld. Once an approaching ship came out of warp, the Exomorphs would attack and puncture the hull of the ship by using a form of acidic venom. This combined with their claws and beastial forms made them very deadly in close quarter combat. Their bestial nature made it impossible to communicate with them and were aggressive to any other species other then their own.

(TNG game: Elite Force II)