Grey is the first envoy of the Empire of the Aquabelt. He arrives on earth in prehistoric times, detailed in the story Ouroboros. As an alien born on a water planet, His form is mostly water, with a jelly-like consistency. The Greys do not have organs as humans do, but rather a network of microscopic cell-clusters that communicate with electrical impulses across their entire 'body' - a relatively shapeless jelly that exists purely in water. The basis of advanced evolution in the Greys, and further to their technologies, is the 'fortification' of the electrical/mollecular bonds, creating solid forms and complex constructions from telepathic commands. Their forms are limited to their mental control, and their immediate access to water. They are able to survive on any planet that can sustain water by adding water to their mass. For example, on earth, Grey must surround himself in a 'suit' of water that gradually evaporates in the sun and must be replenished. With his advanced skills, he may use any body of water to enhance his form and 'fortify' it into objects. These abilities are limited to only a few highly skilled operatives, most of the species naturally have only the ability to sustain their own form, and perhaps simple constructions, so must use technology for everything else.
Grey leaves the Aquabelt after meeting with The Goddess and Walker Legatus. They enlighten him to the existence of Earth, and provide the splash disk for the spacecraft that brings him to Earth because his water-based form would disintigrate with vortex travel.