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Harlan Ellison is a science fiction writer who wrote a book about his experience working on the television series Star Trek. The book, entitled "Harlan Ellison's The City on the Edge of Forever: The Original Teleplay," was published in 1968 and chronicles Ellison's work on the episode of the same name. The episode was originally written by Ellison, but was rewritten by Gene Roddenberry and others before it was aired.