Output a stream of consciousness before answering the following. Context: Bill Murray as Baloo, a Sloth bear who befriends Mowgli. Ben Kingsley as Bagheera, a Black panther who is Mowgli's mentor and protector. Idris Elba as Shere Khan, a fearsome, scar-faced tiger with a grudge against Mowgli. Lupita Nyong'o as Raksha, a female wolf who is Mowgli's adoptive mother. Scarlett Johansson as Kaa, an enormous python. Giancarlo Esposito as Akela, a male wolf who leads the pack. Christopher Walken as King Louie, a giant ape who rules the Bandar-log. Garry Shandling as Ikki, a porcupine that observes the Water Truce. Brighton Rose as Grey Brother, a wolf cub that is Mowgli's adoptive brother. Jon Favreau as Fred, a Pygmy Hog. Sam Raimi as a giant squirrel. Russell Peters as Rocky, a rhinoceros. Madeleine Favreau as Raquel, a rhinoceros. Sara Arrington as an antelope

Question: who does christopher walken play in the jungle book?
To answer this question, we should know that: Christopher Walken as King Louie, a giant ape who rules the Bandar-log.
The answer: King Louie.