Gort is a fictional alien robot that appears in both versions of the science-fiction film The Day The Earth Stood Still - in the original film Gort was responsible for a few deaths but was arguably more of a neutral character than an antagonist, however in the remake Gort becomes a far more substantial threat and has to be destroyed in order to save humanity.
The eight-foot metal robot accompanies Klaatu, a visitor to Earth from a distant planet, aboard a flying saucer. He does not speak, but uses a beam weapon projected from beneath a visor to vaporize weapons and obstacles. Klaatu describes him as being part of an interstellar police force. He announces that the people of the universe constructed numerous robots like Gort and gave them irrevocable powers to respond to violent actions in order to "preserve the peace." He goes on to say that "There's no limit to what Gort could do. He could destroy the Earth."
The character was based loosely on Gnut, a large green robot from outer space in "Farewell to the Master", a 1940 short story by Harry Bates which was used as the basis for Edmund H. North's screenplay. In the story, Gnut is believed to be the servant of his humanoid companion, but reveals himself, at the end, to have been the master.
On screen Gort is a large "seamless" robot that appears to be constructed from a single piece of "flexible metal". He was portrayed by 7'-7" (231 cm)-tall actor Lock Martin wearing a thick foam-rubber suit designed and built by Addison Hehr. Two suits were created, fastened alternately from the front or back so that the robot could appear seamless depending on the camera angle. Another fiberglass statue of Gort was used for close-ups of him firing his beam weapon or when the scene did not call for him to move. In order to maximize the height of the robot, the costume was made with lifts in the boots and was designed so that the figure's helmet stands nearly a foot above the top of Martin's head. Prisms were employed so that Martin could see through the costume's visor and air holes were provided under the robot's chin.
During most of the film, Gort remains motionless in front of the saucer, which rests on the National Mall in central Washington D. C. while scientists and military researchers examine him. At one point Klaatu communicates with him using signals from a flashlight. He also responds to spoken commands, including the famous line "Gort...Klaatu barada nikto", spoken by Patricia Neal's character toward the end of the film.
Gort is an all-CGI effect in the remake. Like the earlier version, he does not speak and shoots deadly beams from his single eye. He is significantly taller in this version, about twenty-eight feet. The name is only used once and is not his original alien name but an acronym for "Genetically Organized Robotic Technology" assigned to the robot while it is being studied by the military and scientists. He serves as the antagonist of the movie.
In this rendition, GORT is composed of a vast swarm of "nanomachines" or "nano bugs", microscopic insect-like devices that self-replicate through the consumption of matter (and possibly energy as the swarm of nano bugs grow in size when fired upon by rockets) and are capable of disintegrating any object or substance they touch. When the need arises, GORT can transform from a solid humanoid form to a huge cloud, which then swarms around targets and devours them. In addition to this mode of attack, GORT still possesses his trademark eye-beam to destroy obstacles, and to also manipulate attacking fighter drones by hacking into their electronic systems via projected beams. He is neutralized by Klaatu at the end of the film to save humanity with a massive EMP that also shuts down all of humanity's electrical technology.
Unlike the 1951 version, the newer GORT robot has 5 digits on each hand, instead of the mitten-style hands. His feet, however, have no digits. Features such as the cuffs, belt, visor, and boots are gone and this version of GORT has a more simplistic surface design, though this appears to "move" in close-up due to his composition.