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Long War Alien Pack
Adds a herd of new aliens to slaughter your soldiers.
Alien Pack
Adds a dozen new aliens and ADVENTs to the game.
A herd of new aliens to slaughter your soldiers. Includes hotfix for CTDs on applying to existing campaigns.
AlienPack
Muton Centurion pack
This mod adds a new alien to XCOM, the Muton Centurion. It will show up roughly mid-campaign.