The Zelosians were a near-human race native to the planet Zelos II. The Zelosians guarded a wonderful secret about their heritage, because they were descended from an intelligent race of plants, and had a liquid form of green chlorophyll for blood. The average Zelosian could not consume sugar, which acted like a powerful alcohol in their bloodstream. The eyes of every Zelosian were emerald green, and were incapable of seeing in the dark. This night-blindness had created a species-wide fear of the dark, and remain hidden indoors after the sun goes down. The average Zelosian was quite superstitious, with a variety of beliefs which would seem ridiculous to the modern being.