故事讲述两个机器人授命在一个神秘星球抚育人类后代，随着宗教差异导致的分崩离析，机器人发现控制人类信仰是一件极度危险的事情。斯科特表示：“我一直在寻找科幻题材的新疆界，这部剧集将展现一个与众不同、充满想象力的世界，同时这部剧也提出了这样的问题：是什么让我们成为了人类？是什么构成了一个家庭？如果我们能重新来过、消除我们所在星球的混乱会怎么样？我们能幸存下去吗？我们能做得更好吗？”

In 2071, roughly fifty years after an accident with a hyperspace gateway made the Earth almost uninhabitable, humanity has colonized most of the rocky planets and moons of the Solar System. Amid a rising crime rate, the Inter Solar System Police (ISSP) set up a legalized contract system, in which registered bounty hunters, also referred to as "Cowboys", chase criminals and bring them in alive in return for a reward.