does not feature an entirely unclothed Ice Warrior; however it includes shots of clawed hands in scenes that some reviewers have compared with Alien, in addition to a revealing of the Ice Warrior's face during the episode's climax. "Cold War" also reveals that the Ice Warrior armour is a bio-mechanical shell intended to protect the Ice Warrior from the cold; as a cold-blooded species, they are susceptible to temperature fluctuations. The shell can be controlled remotely using sonic technology. History The Ice Warriors first appeared in the 1967 story The Ice Warriors, set during a future ice age in the year 3000. A scientific team sent to halt the advance of the glaciers discovers a spacecraft buried underneath the ice, where it has lain for thousands of years together with its Ice Warrior crew. The Martians are revived and attempt to take over the scientific base, but are defeated by the Second Doctor (Patrick Troughton) and their ship destroyed as it tries to take off. They returned in the 1969 serial The Seeds of Death, which takes place in the mid-21st century. In this story, the world has grown dependent on the matter transmission system T-Mat, which an Ice Warrior strike forces intends to exploit to conquer Earth. After seizing the T-Mat relay on the Moon, they use it to send seeds that are intended to reduce the atmosphere's oxygen, resembling the Martian atmosphere and making the Earth hospitable for Martian life. This plan is foiled by the Second Doctor and his companions Jamie (Frazer Hines) and Zoe (Wendy Padbury), and the invading Martian fleet is sent into an orbit around the Sun. When the Ice Warriors returned in 1972, in The Curse of Peladon, it was decided by the production team to subvert the audience's expectations, featuring them as allies of the Third Doctor (Jon Pertwee) rather than villains. The serial depicts the Ice Warriors having renounced violence and become members of a Galactic Federation that, besides Mars, also includes Earth, Alpha Centauri and Arcturus. They had been sent as members of a delegation to negotiate for the planet Peladon to join the Federation, where the Third Doctor encounters them after he and his companion Jo Grant (Katy Manning) are mistaken for the delegates from Earth. The Doctor initially suspects that the Ice Warriors are behind attempted sabotage to the proceedings; however, he accepts that the Ice Warriors have