Fredric Brown was an American science fiction, fantasy, and mystery writer. He is known for his use of humor and for his mastery of the "short short" form—stories of one to three pages, often with ingenious plotting devices and surprise endings. Humor and a postmodern outlook carried over into his novels as well. One of his stories, "Arena", was adapted to a 1967 episode of the American television series Star Trek.

"Arena" is the eighteenth episode of the first season of the American science fiction television series Star Trek. Written by Gene L. Coon and directed by Joseph Pevney, the episode was first broadcast on January 19, 1967.