A free-to-play tower defense strategy game in which the player battles a variety of alien monsters to protect his people from enslavement. Players take on the role of TEP, the strongest of the ancient artificially intelligent battle commanders. After 500 years of isolation, gamers find themselves in a world of complete devastation and an overwhelming alien force laying waste to everything around them. The main goal is to find new and more powerful weapons to protect the last surviving representatives of humanity, and then track the aliens to their place of origin.