The Swarm are the Marines' main and only enemies in Alien Swarm. They seem to be Humankind's main enemy and threat for quite some time, harassing their outer colonies. There are many hostile forms of life to encounter in Alien Swarm. Care must be taken around many of these, for obvious reasons.
Enemies by typeEdit
After years of exhaustive research at the recently overrun Cythe Research Facility in the Tau Ceti 5 system, the combat instincts and battlefield behavior of individual members of the Swarm have been classified into types.
- Main article: Beta Aliens
In addition to the Swarm aliens featured in Jacob's Rest, there are several unused Alien models from the beta version of the game dating back to 2006.
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