When decorated soldier Captain Colter Stevens wakes up in the body of an unknown man, he discovers he's part of a mission to find the bomber of a Chicago commuter train.

一位掌握高科技的杀手，坐在瑞士的家里，使用卫星来完成远在伦敦的暗杀目标的定位。然后，一次任务出了严重差错之后，他感到非常地内疚，于是只身抛开家人，来到伦敦。结果他发现，自己竟成了下一个暗杀目标。

With only three weeks left in his three year contract, Sam Bell is getting anxious to finally return to Earth. He is the only occupant of a Moon-based manufacturing facility along with his computer and assistant, GERTY. When he has an accident however, he wakens to find that he is not alone.