Watch the full movie of The Hitchhiker’s Guide to the Galaxy online, at Youtube.
From the Youtube video description
The Hitchhiker’s Guide to the Galaxy is a 2005 British-American comic science fiction film based on the book of the same name by Douglas Adams. It stars Martin Freeman, Sam Rockwell, Mos Def, Zooey Deschanel and the voices of Stephen Fry (the guide book) and Alan Rickman (Marvin, the Paranoid Android). Shooting was completed in August 2004 and the movie was released on April 28, 2005 in Europe, Australia and New Zealand, and on the following day in Canada and the United States.
The screenplay is by Adams (who died in 2001) and Karey Kirkpatrick; the film is dedicated “For Douglas”.
Arthur Dent wakes up to find his house about to be 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.