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The Nedenah, called Greys by humans, were a species of explorers.
The Nedenah were humanoid, with pale skin, large green eyes and large heads. They were mildly telepathic and were capable of giving off a sense of calm. They had brown and yellow blood. (PROSE: The Devil Goblins from Neptune)
The most well-known Nedenah technology were their flying saucers, which were large, featureless, pale-coloured disks. They were capable of moving thirty times the speed of sound, could stop in a second and were highly manoeuvrable. Though the ships were opaque without any windows, the Nedenah could navigate by telepathically beaming the view from outside. The hull could be shed if it was damaged, leaving an undamaged hull underneath. (PROSE: The Devil Goblins from Neptune)
Other technology was also taken from the wreckage of a crashed Nedenah ship, much of it adapted by the US Army. (PROSE: The Devil Goblins from Neptune) The technology for broadband internet was also derived from the Roswell crash. (TV: Dalek)
In 1947, a Nedenah ship crashed in Roswell, New Mexico. The three survivors and the remains were taken to a secret government base, though one was killed on the way. A year later, another ship was sent to find the survivors. The American government fought it off, taking one survivor, though they had major difficulties. By the third attempt, the technology had been reverse-engineered and the Nedenah were shot out of the sky before they could attempt anything. At this point, they stopped trying to save the captured Nedenah. Though most of the Nedenah were captured, some were secretly kept safe inside of the ships.
In 1970, the Waro were invading Earth when they learnt of the Nedenah prisoners. They forced their agent Viscount Rose to try to kill them, as well as attacking the base themselves. At the same time, Brigadier Lethbridge-Stewart had been captured and brought to the same base. He freed the Nedenah, who took back their ship and used it fight off the Waro. They then removed all of their technology that they could find and left Earth. (PROSE: The Devil Goblins from Neptune)