Silurians is a name attributed to a sapient humanoid species which evolved on the planet Doon'kin Earth, long before the dawn of mankind. They are bipedal reptilianoids with a humanoid erect posture and bodies covered in scales. Their heads sport a five-pointed crest, a pair of long flaps on the sides, a pair of large eyes and a smaller third eye on the forehead. Their mouths seem toothless and appear more fish-like than reptile-like in appearance. They usually speak in deep, guttural voices.