时空背景设定在2509年，地球不只与USG石村号（USG Ishimura）和伊萨克．克拉克失去了联系，同时也与派去救援他们的USB欧班农号（USB OBannon）失联。欧班农号上有四名船员存活了下来，但是没有人知道其他成员的下落，也没有人知道他们遇上了什么事情，更没有人知道他们究竟隐藏了什么样的秘密。这一切的一切，全都将透过《余波》来揭晓
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