The Hitchhiker's Guide to the Galaxy a human-like alien writer for the eccentric, electronic travel guide "The Hitchhiker's Guide to the Galaxy", by hitchhiking onto a passing Vogon spacecraft. Following his rescue, Dent explores the galaxy with Prefect and encounters Trillian, another human who had been taken from Earth prior to its destruction by the President of the Galaxy, the two-headed Zaphod Beeblebrox, and the depressed Marvin, the Paranoid Android. Certain narrative details were changed between the various adaptations. The various versions follow the same basic plot but they are in many places mutually contradictory, as Adams rewrote the story substantially for each new adaptation. Throughout
The Hitchhiker's Guide to the Galaxy on making the alien a roving researcher for a "wholly remarkable book" named "The Hitchhiker's Guide to the Galaxy". As the first radio episode's writing progressed, the "Guide" became the centre of his story, and he decided to focus the series on it, with the destruction of Earth being the only hold-over. Adams claimed that the title came from a 1971 incident while he was hitchhiking around Europe as a young man with a copy of the "Hitch-hiker's Guide to Europe" book: while lying drunk in a field near Innsbruck with a copy of the book and looking up at