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.
The Alliance of Nations were able to locate them on their version of Earth in the late 20th Century, following the Doctor’s advice to help them seek peace with humans and find new settlements to avoid conflict, offering a group to a colony in hopes to build a promising future as well as hoping to build peaceful relations with the Silurians.