Ice Warriors

The Ice Warriors and Ice Lords were a race of reptilian humanoids from the planet Mars, identified by the Eleventh Doctor as cyborgs because of their biomechanical armour. (TV: Cold War) Bill Potts compared them to Vikings. (TV: Empress of Mars)

The Gandorans, who created the first Ice Warriors, called them the Saurian Evolutionaries. (AUDIO: Lords of the Red Planet) They were also known as native Martians (TV: Empress of Mars) and simply Martians (TV: Cold War) but at times were given the derogatory name of Greenies. (PROSE: Transit)

Adult, fully armoured Ice Warriors were large, imposing reptilian humanoids, up to seven feet tall. Unarmoured, they had flattened, scaly faces with sharp fangs and thin green tongues. (PROSE: Legacy, PROSE: The Medusa Effect, TV: Cold War) They had either five (COMIC: Ascendance) or three fingers, tipped with sharp claws. (TV: Cold War) At least some Ice Warriors had large black eyes, (COMIC: Descendance) although Skaldak's were red. (TV: Cold War)

They had skeletons much like humans, though with flatter skulls and wider eye sockets. (COMIC: Ascendance) Females were built more slightly than males, and had spiny dorsal crests which were sexually attractive in a manner analogous to the breasts of a human female. (PROSE: GodEngine, Transit)

They preferred cold climates and could be killed by extreme heat, though small fires were no more dangerous to them than to a human. (COMIC: Descendance) According to the Eleventh Doctor, this weakness was a flaw in their survival armour which couldn't cope with sudden increases in temperature that was never fixed, and not a biological trait. (TV: Cold War) Due to differences in atmosphere and gravity, in Earth-like environments, Ice Warriors perpetually wheezed and tended to move slowly, (TV: The Seeds of Death) though they could move fast when needed. (PROSE: Legacy, TV: Cold War) They spoke in a drawn-out hiss. (TV: The Ice Warriors)