Christopher Lee Yost (born February 21, 1973) is an American film, animation and comic book writer best known as the head writer of the Marvel animated series The Avengers: Earth's Mightiest Heroes and co-writer (with his frequent collaborator Craig Kyle) of the comic book series X-23: Innocence Lost, X-23: Target X, New X-Men, X-Force. and Scarlet Spider (Volume 2).