The (non)existence of extraterrestrial life has been under intense debate ever since the Greek times. Termed “plurality of worlds” in ancient Greece, the possibility of other worlds and life forms beyond or parallel to Earth have long intrigued many philosophers and scientists, such as Aristotle, the ancient atomists, Copernicus, Descartes, Kant, William Whewell, Giovanni Schiaparelli, Newton, to name but a few. On the other hand, the possibility of the existence of extraterrestrial life tends to be downplayed by many as simply a whimsical idea, or at best regarded as a fantasy that exists only in the imaginary world. Sci-fi texts have long included the discussion and the representation of extraterrestrial life, but the interpretation of these alien life forms is more often than not relegated to the fictional, not reality. This seminar proposes to read these life forms in Sci-fi texts seriously by incorporating astrobiology to investigate the possibility of alien life forms both in scientific and literary terms, as more and more evidence revealed in recent years suggests the possible existence of these alien life forms (from macrobiotics to more controversial UFOs or UAPs). The seminar will read seminal texts of astrobiology, philosophical debates on “plurality of worlds,” and Sci-fi texts written/directed by H. G. Wells, H. P. Lovecraft, and Denis Villeneuve (Arrival) to foreground the mutual implications among these distinct and yet interrelated fields.