Douglas Adams was the world-famous creator of the Hitchhiker's Guide to the Galaxy, which has been a radio sitcom, a TV drama, a film and a series of bestselling novels. He was also the author of, among other things, two novels starring the metaphysical detective Dirk Gently: Dirk Gently's Holistic Detective Agency and The Long Dark Teatime of the Soul. John Lloyd is one of the most successful television comedy producers of all time, having been responsible for Not the Nine O'Clock News, Blackadder, QI and The Hitchhiker's Guide to the Galaxy.