Alien Swarm Parasite
The Alien Swarm Parasite is an unlockable headwear item for all Classes. It is obtained by earning the Hat Trick Achievement in the game Alien Swarm.
Trivia
- The Hat Trick achievement is earned by completing 2 co-op missions online.
- This is the second hat that appears to be a still-living creature, the other being the Triboniophorus Tyrannus.
- The Parasite's tail has jiggle-bones making it the second promotional hat with jiggle-bones, the other being Max's Severed Head.
- This hat is the first and only item to be unlocked via the achievements of another game.
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