"Klaatu barada nikto!"

Gort is a silver android featured in the movie The Day the Earth Stood Still. Gort was made by a race of aliens roughly 5,000 years more advanced than Earth (circa 1950). Gort's master is Klaatu. Gort is 8' 8" tall and has some sort of silver liquid polymetal skin that appears to be impregnable to most explosives and kinetic energy rounds.

Gort's primary functions seems to be that of metallic bodyguard, intergalactic peacekeeper, and weapon of mass(terful) destruction. When a panicked doughboy drops a round into Klaatu, Gort quickly disintegrated all nearby weapons with a head-mounted laser recessed behind a sliding face plate. When Klaatu is captured and killed, Gort proceeds to exact revenge by leveling Washington, D.C. Gort can only be stopped by uttering the classic line "Gort! Klaatu barada nikto!"

It's speculated that Gort! Klaatu barada nikto! means "Gort! Klaatu orders you to stop" or "Gort! Klaatu is in danger".

The phrase Klaatu barada nicto has been used in several other movies in a sort of easter egg fashion. In the movie Tron, Tron's creator Alan Bradley has a poster on his wall with this phrase. Director Sam Reimi used it in Army of Darkness (it's the phrase that must be uttered to stop evil stuff). It also appeared in an episode of the cartoon Hercules. George Lucas has made a couple references to Gort's safe word in his Star Wars films. In the original movie, there are three characters in the cantina named Klatu, Barada, and Nikto.

The Day the Earth Stood Still was based on a Harry Bates short story called "Farewell to the Master" (first appearing in Astounding Stories, October 1940). The Gort robot itself was based on the story's robot named GNUT. GNUT had a much more human appearance, resembling a green metallic man with bulging muscles and a loin cloth. GNUT became Gort in the screen adaptation because "Gort" was thought easier to pronounce.

Gort was played by 7' 7" tall actor Lock Martin. Like many "giants", Martin did not live long. He died at the age of 43 in 1959. For a time, he was the tallest actors in the Screen Actors Guild.