It is speculative life that could exist outside of Earth but didn't emerge there. Such life could range from basic prokaryotic cells to smart and homosapiens, potentially spawning cultures far more high-tech than humanity. Astrobiology is the study of life on other planets.
But before we get a glimpse of this possibly extraterrestrial being, a whole lot happens in episode 5 of Extant , which dives right in to classic conspiracy-thriller territory à la The X-Files
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