Sontarans

The Sontarans were a race of belligerent and militaristic clones from the planet Sontar, created by the Kaveetch. They waged an eternal war throughout Mutter's Spiral against the Rutan Host, though they made no effort to change this nor did they want peace.

The Sontarans were humanoids with large, bulbous heads and short stocky bodies; humans who met them, such as Sarah Jane Smith, Clyde Langer and Bea Nelson-Stanley, often compared them to "huge potatoes with ray guns". (TV: Eye of the Gorgon, The Last Sontaran) They had grey-brown skin and deep set features. Sontarans generally had three digits on each hand (two fingers and a thumb), (TV: The Time Warrior, et al) though some had five fingers on each hand. (TV: The Sontaran Experiment) Some Sontarans also had vestigial hair, generally in the form of beards, which grew white with age. (PROSE: Shakedown) Sontaran blood was green. (TV: The Two Doctors, The Last Sontaran)

According to Strax, Sontarans' heights were "to precise warrior specifications". (AUDIO: A Photograph to Remember)

The Sontarans reproduced by cloning, meaning each Sontaran was nearly identical to each other. There were some variations over time, such as the number of fingers, (TV: The Sontaran Experiment)