Turn-based tactical combat set in Mega-Primus, a self-contained city built over ruined Toronto after Earth's biosphere collapsed. You command X-COM forces against extradimensional aliens invading through pyramid-shaped gates. Fourteen alien species attack—Anthropods, Brainsuckers, Hyperworms, Megaspawns, Micronoids—each with distinct biology and interdependencies. Combat plays out in city streets where gangs, religious groups, and corrupted police can turn hostile if aliens infiltrate local politics. Brainsuckers leap onto heads and inject payloads; research reveals the invasion's architects are Micronoids, sapient single-celled organisms controlling host bodies through psionic domination. Late-game missions send your squads through the gates into the alien dimension to shut down the invasion at its source. Real-time and turn-based modes available. Expect urban warfare where collateral damage affects faction relations and your funding.
