Gray

Grays are genetically-engineered creatures in Deus Ex and Deus Ex: Invisible War.

Physical characteristics
Grays are the products of experiments undertaken by the Majestic-12-operated company, VersaLife. The Grays are created by crossing human DNA with other genomes, hence Grays, along with Greasels and Karkians, are known as transgenics.

Grays are grey/silvery in complexion, are totally hairless, have enlarged heads and solid black eyes, and have long, gangling arms and legs.

Grays thrive in frigid or radioactive environments (but are capable of living in warm and non-radioactive environments as well), hence the reason why they are normally found in radioactive areas in Area 51, and why they live in Antarctica in Invisible War. The Grays themselves emit deadly amounts of radiation, and can direct concentrated doses of radiation to an enemy target. Hence, when facing Grays, it is paramount that a Hazmat suit, the Regeneration augmentation/biomod, the Environmental Resistance augmentation (if they are encountered in Deus Ex) or the Hazard Drone biomod (if they are encountered in Invisible War) is used, to prevent serious damage to health.

Role in the storyline
Grays in Deus Ex do not talk, because in the only two areas where they are found (VersaLife and Area 51), they are kept isolated in cages, and have thus become feral. During the Collapse event, JC Denton frees the Grays from Area 51, and convinces them to help him. It is unclear how the Grays became more civilized (JC's merger with Helios may be a factor), but in Invisible War, not only do the Grays talk, but are very friendly to any ally of ApostleCorp. The Grays are also revealed to live in Antarctica in Invisible War. Due to their lack of biomod infusions, Grays cannot go through the portal, and so must be transported the long way to the ApostleCorp facility in Trier.

Grays will readily attack any enemy of ApostleCorp, including the player (Alex D), if he/she is affiliated with another faction in the endgame. Due to being genetically-engineered, the Knights Templar attempt to kill Grays whenever possible. In the Templar ending, a Gray can be seen hanging from a noose.

Szarak