Captain Howdy

In the novel and film "The Exorcist" the name "Captain Howdy" is what young Regan MacNeil uses to describe the demonic presence during the early stages of her possession. It is first thought by both her mother and the various doctors who treat her to be an imaginary friend. While showing her mother how to use a Ouija board she explains that she (Regan) makes the questions and he (Captain Howdy) does the answers. Later, under hypnosis, a psychiatrist asks Regan if the person inside of her is "Captain Howdy",