White Walker

White Walkers are humanoid creatures from the HBO television series Game of Thrones, and the George R. R. Martin novel series A Song of Ice and Fire on which it is based. Primarily referred to as the Others in the novels, White Walkers are a supernatural threat to mankind who dwell north of The Wall in Westeros. The Verge named them among "the most visually iconic creatures on the show". White Walkers are also featured in the show's merchandising.

Martin introduces the Others in the prologue of A Game of Thrones (1996), describing them as "Tall [...] and gaunt and hard as old bones, with flesh pale as milk" with eyes "deeper and bluer than any human eyes, a blue that burned like ice". Accompanied by intense cold, they wear armor that "seemed to change color as it moved", and wield thin crystal swords capable of shattering steel. The Others move silently, and they speak their own language; Martin writes that their voices are "like the cracking of ice on a winter lake". In A Storm of Swords (2000), they are shown to be vulnerable to weapons made of dragonglass (obsidian), as Samwell Tarly kills one this way:

The Other's armor was running down its legs in rivulets as pale blue blood hissed and steamed around the black dragonglass dagger in its throat [...] where its fingers touched the obsidian they smoked [...] the Other shrank and puddled, dissolving away. In twenty heartbeats its flesh was gone, swirling away in a fine white mist. Beneath were bones like milkglass, pale and shiny, and they were melting too. Finally only the dragonglass dagger remained, wreathed in steam [...] Grenn bent to scoop it up and flung it down again at once. "Mother, that's cold."

In A Dance with Dragons (2011), Sam uncovers ancient record fragments which suggest that the Others are also vulnerable to something called "dragonsteel", which he and Jon Snow surmise is another term for Valyrian steel.

Creatures killed by the Others soon reanimate as wights: undead with pallid skin, black hands, and glowing blue eyes similar to the Others'. Dragonglass has no effect on wights in the books (though it kills them in the TV series). Although wights can be physically injured, even dismembered parts will remain animated, but they can be destroyed by fire. The humans who live in the north beyond the Wall—called "wildlings" by the inhabitants of Westeros—burn their dead so they will not become wights. Wildlings call the Others "White Walkers", unlike others in Westeros.

In 2012, Chris Lackner wrote in Dose, "Fans of the novels are eagerly awaiting Martin's final two installments of the seven-part series. In particular, they are eager to learn more about the White Walkers—or The Others—a mysterious, undead race seemingly bent on humanity's destruction."

In the novels and the 2014 companion book The World of Ice & Fire, Martin establishes that, millennia before the events of A Song of Ice and Fire series, a pact existed between the Children of the Forest (elf-like creatures) and the First Men (mankind). This was weakened by the emergence of the Others, an enigmatic and malevolent nonhuman species who inflicted a night that lasted a generation and a winter that lasted decades. After the Others were pushed back, the Children and the First Men raised The Wall, a vast barrier of stone, ice and magic from one coast of northern Westeros to the other, to bar the passage of the Others south.

As A Game of Thrones (1996) begins, the general belief across Westeros is that the Others are a legend to scare children, or else "gone eight thousand years". But the Others have re-emerged, and are gaining power—and creating wights—beyond the Wall. In the Prologue, a ranging party from the Night's Watch come face to face with a group of the Others, who kill Ser Waymar Royce. Reanimated as a wight, he then kills the ranger Will. Out ranging beyond the Wall, Jon Snow and the Night's Watch find the corpses of two of their fallen brothers. Brought home to Castle Black, the dead men rise and kill several of their living fellows before they are destroyed.