Alien Zerg invades and devours everything. The protagonist Chen Feng binds the [Steel Defense System]. In the apocalypse, cities are reduced to ruins, and humans form a resistance army to fight back with difficulty. The system can exchange for mecha equipment, upgrade defenses, and summon supporting firepower. Chen Feng led the mecha team to block the expansion of the Zerg nests, crack the Zerg genetic weaknesses, unite global resistance forces to build an interstellar defense line, and finally repel the Zerg and regain the homeland of mankind.
