Jack，Gwen还有Ianto，遗憾的是他们失去了2个最好的战友，尽管他们沉浸在悲伤之中，但是他们仍然还有工作去完成，因为外星人从未放弃对地球的侵略。这一次他们面临空前艰巨的斗争，外星人控制了地球...
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