One Thursday, lunchtime, Arthur Dent discovers that his house is to be immediately demolished in order to make way for a bypass. He tries delaying the bulldozers by lying down in front of them. Ford Prefect, a friend of Arthur's, convinces him to go to the pub with him. Over a pint of beer (as "muscle relaxant"), Ford explains that he is an alien from a planet in the vicinity of Betelgeuse, and a journalist working on the Hitchhiker's Guide to the Galaxy, a universal guide book, and that the Earth is to be demolished later that day by a race called Vogons, in order to make way for a hyperspace bypass. Suddenly, a Vogon Constructor Fleet appears in the sky and destroys the planet. Ford saves himself and Arthur by hitching a ride on a Vogon ship. The two are discovered and thrown out of an airlock, but are picked up by the starship Heart of Gold. They find Ford's "semi-half brother" Zaphod Beeblebrox, the President of the Galaxy. He has stolen the ship along with Tricia "Trillian" McMillan, an Earth woman whom Arthur had met previously, and Marvin the Paranoid Android. Zaphod explains that he is seeking the planet Magrathea, where he believes he can discover the Question of Life, the Universe, and Everything to match with the answer "42" given by the supercomputer Deep Thought. Zaphod stole the Heart of Gold to use its improbability drive to get to Magrathea through trial and error. Based on the book of the same name by Douglas Adams.