The Forge is a fictional black operations organization from the Big Finish Productions audio plays based on the long-running British science fiction television series Doctor Who. The Forge, also known as Department C4, was founded at the turn of the 20th century to study and experiment with extraterrestrial material and technology and apply it to the security interests of the United Kingdom. It first appeared in Project: Twilight, written by Cavan Scott and . Its agents can sometimes be identified with the use of the code phrase or motto, "For King and Country."