Martian

These rather creepy aliens are what primitive life-forms believe all extra-terrestrials look like. However, as we all know, there are many other beings that look completely different. For example, Daleks, Slitheen and Grunts. These aliens seem extremely disproportionate. These aliens are usually from Mars.

Another nickname for Martians is Grays, but these turned out to be a completely different race of Aliens altogether. Technically, Martians themselves do not exist, so this species is only theoretical. However, there are two races that affiliate themselves with Mars. One called themselves Ice Warriors and lived in the Icy catacombs of Mars before their species was eradicated by Plague. A race of Gray-like beings came from some other world to populate Mars, but soon left.