The Book

aka: The Hitchhiker's Guide to the Galaxy  Galactic reference book.   Voiced by: Peter Jones
The Hitchhiker's Guide To The Galaxy. The Book. Image credit: British Broadcasting Corporation.

While not technically a character, The Guide serves as the narrator to the series and expands on some of the finer aspects of Galactic society, culture and history. Indeed, many of the most memorable sequences in the series are entries from the Guide.

By its own admission The Guide contains much information that is apocryphal, or at least wildly inaccurate, but what it does have is a cheap price, the words "DON'T PANIC" in large friendly letters on the front and a voice that speaks its entries in a calm and level tone.

Arthur Dent

aka: Arthur Philip Dent; Monkeyman  Galactic hitchhiker.   Played by: Simon Jones
The Hitchhiker's Guide To The Galaxy. Arthur Dent (Simon Jones). Image credit: British Broadcasting Corporation.

Arthur is a six foot tall, carbon-based, bipedal life form descended from an ape. He wanders the galaxy still in his dressing gown in a state of confusion and is constantly perplexed by the events that surround him. To top it off, he is always hit with a fresh shock before he has really had time to recover from the last one and as a result his mind can never really catch up with and comprehend the current situation.

Instead of worrying himself about it all however, he is often more interested in trying to find himself a nice hot cup of tea. Although out of his element, Arthur is generally well-meaning and does his best to lend advice and help in sticky and bizarre situations.

Ford Prefect

aka: Real name is only pronounceable in a dead Betelgeusean language.  Researcher.   Played by: David Dixon
The Hitchhiker's Guide To The Galaxy. Ford Prefect (David Dixon). Image credit: British Broadcasting Corporation.

Ford is not descended from an ape. He is in fact from a small planet somewhere in the vicinity of Betelgeuse and is a roving researcher for The Hitchhikers Guide to the Galaxy.

Ford originally intended to stay on the Earth for two weeks but was stranded for 15 years, during which he pretended to be and out-of-work actor. He is known for being an unruly boozer and although eccentric, he is harmless in his ways. Ford is quite savvy to the ways of the galaxy and does his best to help out Arthur along their travels, but more often than not encounters difficulty with his friend's lack of comprehension and just gives up.

Zaphod Beeblebrox

aka: Zaphod Beeblebrox the First; President Beeblebrox; Ex-President Beebleborx  Played by: Mark Wing-Davey
The Hitchhiker's Guide To The Galaxy. Zaphod Beeblebrox (Mark Wing-Davey). Image credit: British Broadcasting Corporation.

Entrepreneur, professional party-goer, ex-president of the galaxy, wanted fugitive and all round self-proclaimed amazing guy, Zaphod is essentially "The man" of the galaxy.

Suave, smooth talking, but completely narcissistic and self-obsessed, Zaphod lives on a total whim and does whatever may come into his heads at any given time... such as stealing the starship Heart of Gold at its unveiling while he was Galactic President.

Despite his cool and laid back image, Zaphod is not at all averse to running away and hiding from a problem, nor is he particularly overburdened with an acute sense of morality. Famous for being astoundingly clever, he can also be astoundingly stupid, something which he often covers up by having a dig at Arthur and making him look like a fool. Oh yes, he also has two heads and three arms.

Trillian

aka: Tricia McMillian  Doctor of astrophysics.   Played by: Sandra Dickinson
The Hitchhiker's Guide To The Galaxy. Trillian (Sandra Dickinson). Image credit: British Broadcasting Corporation.

Trillian has a degree in mathematics and a doctorate in astrophysics, so when she met Zaphod at a party in Islington, she jumped at the chance to see the galaxy... it was either that or back to the dole queue on Monday.

Easily the most sensible one of the group, it is often quite clear that she knows more about what is going on than either Ford or Zaphod despite their Galactic experience. She alone seems to have some amount of control over Zaphod, as well as constantly doing her best to be nice to Marvin, even after everyone else has given up.

Marvin

aka: The Paranoid Android  Robot.   Voiced by: Stephen Moore
The Hitchhiker's Guide To The Galaxy. Marvin. Image credit: British Broadcasting Corporation.

Marvin is a 'personality prototype' from the Sirius Cybernetic Corporation's new line of robots with "Genuine People Personalities" and regards life, the universe and everyone in it with utter contempt.

Constantly depressed and extremely sulky, Marvin has a brain the size of a planet and therefore resents the menial tasks he is frequently asked to perform.

Eddie

aka: Eddie the Shipboard Computer  Computer on the Heart of Gold.   Voiced by: David Tate

Eddie is the on-board computer on the Heart of Gold, the spaceship stolen by Zaphod Beeblebrox. Unlike Marvin, Eddie is constantly upbeat and cheerful. Even when the ship is about to be destroyed by two nuclear missiles, he spends his time trying to calm the crew by singing You'll Never Walk Alone.

Prostetnic Vogon Jeltz

Vogon Constructor Fleet Captain.   Played by: Martin Benson
The Hitchhiker's Guide To The Galaxy. Prostetnic Vogon Jeltz (Martin Benson). Image credit: British Broadcasting Corporation.

The head of a Vogon Constructor Fleet, Prostetnic is the Vogon who demolishes Earth at the beginning of the series.

Prostetnic is very typical of his species, in that like most Vogons, his main interests involve shouting orders at people below him, obeying the bureaucratic orders of his masters, and writing terrible poetry.