On the TV series, "The Game of Thrones," who created the first White Walker?

On the TV show "The Game of Thrones," as with the book, the Children of the Forest are responsible for the creation of the first White Walker. It has also been pointed out that the Children are an ancient race of magical beings. Not only that, they created the White Walkers to directly combat the First Men in Westeros. Then this "weapon" (the Children's creation) took on a life of its own. It has its own idea about how it should function.

Also, the White Walkers are responsible for the "Long Night," a period of darkness that comes to the world. It is a threat that can wipe out both humans and the Children. Legend now has it that a hero teamed up with the Children to fight the White Walkers. It was after this that the Wall was built and the Night's Watch was created.

So the Children created the White Walkers because men were a threat. Then the humans and the Children had to come together to fight against the White Walkers when they grew more powerful and developed the ability to kill everything!