During its return to the earth, commercial spaceship Nostromo intercepts a distress signal from a distant planet. When a three-member team of the crew discovers a chamber containing thousands of eggs on the planet, a creature inside one of the eggs attacks an explorer. The entire crew is unaware of the impending nightmare set to descend upon them when the alien parasite planted inside its unfortunate host is birthed.

The crew of the colony ship Covenant, bound for a remote planet on the far side of the galaxy, discovers what they think is an uncharted paradise but is actually a dark, dangerous world.

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？”