The Restaurant at the End of the Universe (Hitchhiker's Guide Series #2)

This sequel to The Hitchhiker's Guide to the Galaxy finds Arthur Dent, reluctant space adventurer, joining Zaphod Beeblebrox—two-headed former president of the galaxy—Zaphod's dead great-grandfather, sexy cadet Trillian, and paranoid Marvin in the search for the ruler of the Universe.