High Quality Content by WIKIPEDIA articles! The Xeelee are a species featured in the Xeelee Sequence series of books by British science fiction author Stephen Baxter. In this setting, the Xeelee represent the unattainable pinnacle of technological development. As a result, they are feared and envied by other star-faring Xeelee Sequence species, most of which the Xeelee themselves ignore. The only known exception is Humanity, whom the Xeelee eventually attacked and imprisoned after two long wars were fought between the two species.