Taken from mobygames.com:

You are Arthur Dent, an Englishman with a bad hangover wearing a dressing gown containing a much needed buffered analgesic and some fluff. Your house has just been destroyed, followed shortly thereafter by your planet Earth (mostly harmless). You’ve been rescued by your friend Ford Prefect, who’s not actually an out-of-work actor. He has given you a book (The Hitchhiker’s Guide to the Galaxy), a towel, and is now telling you to put a fish in your ear. It must be a Thursday; you’ve never quite gotten the hang of Thursdays.

http://www.mobygames.com/game/dos/hitchhikers-guide-to-the-galaxy