The Invasion DLC adds a battle for the planet with a hostile alien race to the game.

The player can call for a giant spaceship to appear in orbit, which will send well-armed troops to the surface over and over again.

DLC details:

• Underground alien bases with new mobs and resources.
  
• New weaponry and construction technologies based on alien structures and mechanisms.
  
• A conflict between ecosystems of two worlds hostile to each other and contamination of the earth and its resources.