The Restaurant at the End of the Universe is the second book in the Hitchhiker's Guide to the Galaxy comedy science fiction series by Douglas Adams, and serves as a sequel. The narrative continues the adventures of Arthur Dent and his companions as they navigate through space powered by pure improbability, all while seeking a place to dine. Among the characters are Ford Prefect, a long-time friend and contributor to the Guide; Zaphod Beeblebrox, the eccentric two-headed ex-president of the galaxy; Tricia McMilan, who has adapted to her interstellar surroundings under the name Trillian; and Marvin, the perpetually depressed robot.

The story is filled with wit, unexpected twists, and a vivid imagination that has cemented it as a favorite among fans of the genre. The titular Milliways, known as the Restaurant at the End of the Universe, serves as one of the key settings, offering a dining experience that is literally out of this world.