在高度机械化的未来，先驱者集团的高级技术员梅尔斯发现，自己研发的S.A.R.型军用战斗机器人出现多起自我编程现象。与此同时，一直精英陆战小队被分派到先驱者集团的机器人训练基地进行实弹演练。梅尔斯跟随小队来到这个孤岛，发现通讯被阻断。由普科斯率领的小队在和小波机器人作战后，夜晚一名哨兵被机器人杀死，一场单纯的训练变成殊死战役。这座小岛正是S.A.R.型机器人的训练场地，而梅尔斯也发现，发出这次实弹演练指令的正是岛上的一个机器人...Set in a near future, technology-reliant society is creating killing machines. Against this backdrop an elite army unit is helicoptered in to a remote, off-the-grid island training facility, to test the capabilities of the latest prototypes. They set up positions and make short work of the AI targets in the killing field. However, overnight their sentry goes missing, and when they find the corpse the next day they find themselves in the killing field and the tables have turned. The marines fight to survive on an island is overrun by an enemy intelligence far beyond their predecessors, which learns from their every move.