The broad narrative of Hitchhiker follows the misadventures of the last surviving man, Arthur Dent, following the demolition of the planet Earth by a Vogon constructor fleet to make way for a hyperspace bypass. Dent is rescued from Earth's destruction by Ford Prefect—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 two-headed President of the Galaxy Zaphod Beeblebrox and the depressed Marvin, the Paranoid Android.

"You know nothing of future time," pronounced Deep Thought, "and yet in my teeming circuitry I can navigate the infinite delta streams of future probability and see that there must one day come a computer whose merest operational parameters I am not worthy to calculate, but which it will be my fate eventually to design."

Fook sighed heavily and glanced across to Lunkwill.

"Can we get on and ask the question?" he said.

Lunkwill motioned him to wait.

"What computer is this of which you speak?" he asked.

"I will speak of it no further in this present time," said Deep Thought. "Now. Ask what else of me you will that I may function. Speak."

They shrugged at each other. Fook composed himself.

"O Deep Thought Computer," he said, "the task we have designed you to perform is this. We want you to tell us..." he paused, "...the Answer!"

"The answer?" said Deep Thought. "The answer to what?"

"Life!" urged Fook.

"The Universe!" said Lunkwill.

"Everything!" they said in chorus.

Deep Thought paused for a moment's reflection.

"Tricky," he said finally.

"But can you do it?"

Again, a significant pause.

"Yes," said Deep Thought, "I can do it."

"There is an answer?" said Fook with breathless excitement.

"A simple answer?" added Lunkwill.

"Yes," said Deep Thought. "Life, the Universe, and Everything. There is an answer. But," he added, "I'll have to think about it."

7.5 Million years later

"Good morning," said Deep Thought at last.

"Er... Good morning, O Deep Thought," said Loonquawl nervously, "do you have... er, that is..."

"An answer for you?" interrupted Deep Thought majestically. "Yes. I have."

The two men shivered with expectancy. Their waiting had not been in vain.

"There really is one?" breathed Phouchg.

"There really is one," confirmed Deep Thought.

"To Everything? To the great Question of Life, the Universe and Everything?"

"Yes."

Both of the men had been trained for this moment, their lives had been a preparation for it, they had been selected at birth as those who would witness the answer, but even so they found themselves gasping and squirming like excited children.

"And you're ready to give it to us?" urged Loonquawl.

"I am."

"Now?"

"Now," said Deep Thought.

They both licked their dry lips.

"Though I don't think," added Deep Thought, "that you're going to like it."

"Doesn't matter!" said Phouchg. "We must know it! Now!"

"Now?" inquired Deep Thought.

"Yes! Now..."

"Alright," said the computer and settled into silence again.

The two men fidgeted. The tension was unbearable.

"You're really not going to like it," observed Deep Thought.

"Tell us!"

"Alright," said Deep Thought. "The Answer to the Great Question..."

"Yes!.."

"Of Life, the Universe and Everything..." said Deep Thought.

"Yes!.."

"Is..." said Deep Thought, and paused.

"Yes!.."

"Is..."

"Yes!!!?.."

"Forty-two," said Deep Thought, with infinite majesty and calm.

It was a long time before anyone spoke.
Out of the corner of his eye Phouchg could see the sea of tense expectant faces down in the square outside.

"We're going to get lynched aren't we?" he whispered.

"It was a tough assignment," said Deep Thought mildly.

"Forty-two!" yelled Loonquawl. "Is that all you've got to show for seven and a half million years' work?"

"I checked it very thoroughly," said the computer, "and that quite definitely is the answer. I think the problem, to be quite honest with you, is that
you've never actually known what the question is."

"But it was the Great Question! The Ultimate Question of Life, the Universe and Everything!" howled Loonquawl.

"Yes," said Deep Thought with the air of one who suffers fools gladly, "but what actually is it?"

A slow stupefied silence crept over the men as they stared at the computer and then at each other.

"Well, you know, it's just Everything... Everything..." offered Phouchg weakly.

"Exactly!" said Deep Thought. "So once you do know what the question actually is, you'll know what the answer means."

"Oh terrific," muttered Phouchg flinging aside his notebook and wiping away a tiny tear.

"Look, alright, alright," said Loonquawl, "can you just please tell us the Question?"

"The Ultimate Question?"

"Yes!"

"Of Life, the Universe, and Everything?"

"Yes!"

Deep Thought pondered this for a moment.

"Tricky," he said.

"But can you do it?" cried Loonquawl.

Deep Thought pondered this for another long moment.

Finally: "No," he said firmly.

Both men collapsed on to their chairs in despair.

"But I'll tell you who can," said Deep Thought.

They both looked up sharply.

"Who?" "Tell us!"

Suddenly Arthur began to feel his apparently non-existent scalp begin to crawl as he found himself moving slowly but inexorably forward towards the console, but it was only a dramatic zoom on the part of whoever had made the recording he assumed.

"I speak of none other than the computer that is to come after me," intoned Deep Thought, his voice regaining its accustomed declamatory tones. "A computer whose merest operational parameters I am not worthy to calculate—and yet I will design it for you. A computer which can calculate the Question to the Ultimate Answer, a computer of such infinite and subtle complexity that organic life itself shall form part of its operational matrix. And you yourselves shall take on new forms and go down into the computer to navigate its ten-million-year program! Yes! I shall design this computer for you. And I shall name it also unto you. And it shall be called... The Earth."

Phouchg gaped at Deep Thought.

"What a dull name," he said.

"Ford," he said suddenly, "look, if that Question is printed in my brain wave patterns but I'm not consciously aware of it it must be somewhere in my unconscious."

"Yes, I suppose so."

"There might be a way of bringing that unconscious pattern forward."

"Oh yes?"

"Yes, by introducing some random element that can be shaped by that pattern."

"Like how?"

"Like by pulling Scrabble letters out of a bag blindfolded."

Ford leapt to his feet.

"Brilliant!" he said. He tugged his towel out of his satchel and with a few deft knots transformed it into a bag.

"Totally mad," he said, "utter nonsense. But we'll do it because it's brilliant nonsense. Come on, come on."

The sun passed respectfully behind a cloud. A few small sad raindrops fell.
They piled together all the remaining letters and dropped them into the bag. They shook them up.

"Right," said Ford, "close your eyes. Pull them out. Come on come on, come on."

Arthur closed his eyes and plunged his hand into the towelful of stones. He jiggled them about, pulled out four and handed them to Ford. Ford laid them along the ground in the order he got them.

"W," said Ford, "H, A, T ... What!"

He blinked.

"I think it's working!" he said.

Arthur pushed three more at him.

"D, O, Y ... Doy. Oh perhaps it isn't working," said Ford.

"Here's the next three."

"O, U, G ... Doyoug ... It's not making sense I'm afraid."

Arthur pulled another two from the bag. Ford put them in place.

"E, T, doyouget ... Do you get!" shouted Ford, "it is working! This is amazing, it really is working!"

"More here." Arthur was throwing them out feverishly as fast as he could go.

"I, F," said Ford, "Y, O, U, ... M, U, L, T, I, P, L, Y, ... What do you get if you multiply, ... S, I, X, ... six, B, Y, by, six by ... what do you get if you multiply six by ... N, I, N, E, ... six by nine ..." He paused. "Come on, where's the next one?"

"Er, that's the lot," said Arthur, "that's all there were."

He sat back, nonplussed.

He rooted around again in the knotted up towel but there were no more letters.

"You mean that's it?" said Ford.

"That's it."

"Six by nine. Forty-two."

"That's it. That's all there is."

"Sounds good so far."

"It's there for us to eat. Either it's good or it's bad, either they want to feed us or to poison us. If it's poisonous and we don't eat it they'll just attack us some other way. If we don't eat, we lose out either way."

"I like the way you're thinking," said Ford, "Now eat one."

Hesitantly, Arthur picked up one of those things that looked like pears.

"I always thought that about the Garden of Eden story," said Ford.

"Eh?"

"Garden of Eden. Tree. Apple. That bit, remember?"

"Yes of course I do."

"Your God person puts an apple tree in the middle of a garden and says do what you like guys, oh, but don't eat the apple. Surprise surprise, they eat it and he leaps out from behind a bush shouting `Gotcha'. It wouldn't have made any difference if they hadn't eaten it."

"Why not?"

"Because if you're dealing with somebody who has the sort of mentality which likes leaving hats on the pavement with bricks under them you know perfectly well they won't give up. They'll get you in the end."

"What are you talking about?"

"Never mind, eat the fruit."

"You know, this place almost looks like the Garden of Eden."

"Eat the fruit."

"Sounds quite like it too."

Arthur took a bite from the thing which looked like a pear.

"It's a pear," he said.

It was moving so slowly that before too long they caught the creature up and could see that it was made of worn, scarred and twisted metal.

It groaned at them as they approached it, collapsing in the hot dry dust.

"So much time," it groaned, "oh so much time. And pain as well, so much of that, and so much time to suffer it in too. One or the other on its own I could probably manage. It's the two together that really get me down. Oh hello, you again."

"Marvin?" said Arthur sharply, crouching down beside it. "Is that you?"

"You were always one," groaned the aged husk of the robot, "for the super-intelligent question, weren't you?"

"What is it?" whispered Fenchurch in alarm, crouching behind Arthur, and grasping on to his arm. "He's sort of an old friend," said Arthur. "I ..."

"Friend!" croaked the robot pathetically. The word died away in a kind of crackle and flakes of rust fell out of its mouth.

"You'll have to excuse me while I try and remember what the word means. My memory banks are not what they were you know, and any word which falls into disuse for a few zillion years has to get shifted down into auxiliary memory back-up. Ah, here it comes."

The robot's battered head snapped up a bit as if in thought.

"Hmm," he said, "what a curious concept."

He thought a little longer.

"No," he said at last, "don't think I ever came across one of those. Sorry, can't help you there."

He scraped a knee along pathetically in the dust, and then tried to twist himself up on his misshapen elbows.

"Is there any last service you would like me to perform for you perhaps?" he asked in a kind of hollow rattle. "A piece of paper that perhaps you would like me to pick up for you? Or maybe you would like me," he continued, "to open a door?"

His head scratched round in its rusty neck bearings and seemed to scan the distant horizon.

"Don't seem to be any doors around at present," he said, "but I'm sure that if we waited long enough, someone would build one. And then," he said slowly twisting his head around to see Arthur again, "I could open it for you. I'm quite used to waiting you know."

"Arthur," hissed Fenchurch in his ear sharply, "you never told me of this. What have you done to this poor creature?"

"Nothing," insisted Arthur sadly, "he's always like this ..."

"Ha!" snapped Marvin. "Ha!" he repeated. "What do you know of always? You say `always' to me, who, because of the silly little errands your organic lifeforms keep on sending me through time on, am now thirty-seven times older than the Universe itself? Pick your words with a little more care," he coughed, "and tact."

He rasped his way through a coughing fit and resumed.

"Leave me," he said, "go on ahead, leave me to struggle painfully on my way. My time at last has nearly come. My race is nearly run. I fully expect," he said, feebly waving them on with a broken finger, "to come in last. It would be fitting. Here I am, brain the size ..."

Between them they picked him up despite his feeble protests and insults. The metal was so hot it nearly blistered their fingers, but he weighed surprisingly little, and hung limply between their arms.

They carried him with them along the path that ran along the left of the Great Red Plain of Rars toward the encircling mountains of Quentulus Quazgar.

Arthur attempted to explain to Fenchurch, but was too often interrupted by Marvin's dolorous cybernetic ravings.
They tried to see if they could get him some spare parts at one of the booths, but Marvin would have none of it.

"I'm all spare parts," he droned.

"Let me be!" he groaned.

"Every part of me," he moaned, "has been replaced at least fifty times ... except ..." He seemed almost imperceptibly to brighten for a moment. His head bobbed between them with the effort of memory. "Do you remember, the first time you ever met me," he said at last to Arthur. "I had been given the intellect-stretching task of taking you up to the bridge? I mentioned to you that I had this terrible pain in all the diodes down my left side? That I had asked for them to be replaced but they never were?"

He left a longish pause before he continued. They carried him on between them, under the baking sun that hardly ever seemed to move, let alone set.

"See if you can guess," said Marvin, when he judged that the pause had become embarrassing enough, "which parts of me were never replaced? Go on, see if you can guess.

"Ouch," he added, "ouch, ouch, ouch, ouch, ouch."

At last they reached the last of the little booths, set down Marvin between them and rested in the shade. Fenchurch bought some cufflinks for Russell, cufflinks that had set in them little polished pebbles which had been picked up from the Quentulus Quazgar Mountains, directly underneath the letters of fire in which was written God's Final Message to His Creation.

Arthur flipped through a little rack of devotional tracts on the counter, little meditations on the meaning of the Message.

"Ready?" he said to Fenchurch, who nodded.

They heaved up Marvin between them.

They rounded the foot of the Quentulus Quazgar Mountains, and there was the Message written in blazing letters along the crest of the Mountain. There was a little observation vantage point with a rail built along the top of a large rock facing it, from which you could get a good view. It had a little pay-telescope for looking at the letters in detail, but no one would ever use it because the letters burned with the divine brilliance of the heavens and would, if seen through a telescope, have severely damaged the retina and optic nerve.

They gazed at God's Final Message in wonderment, and were slowly and ineffably filled with a great sense of peace, and of final and complete understanding.

Fenchurch sighed. "Yes," she said, "that was it."

They had been staring at it for fully ten minutes before they became aware that Marvin, hanging between their shoulders, was in difficulties. The robot could no longer lift his head, had not read the message. They lifted his head, but he complained that his vision circuits had almost gone.

They found a coin and helped him to the telescope. He complained and insulted them, but they helped him look at each individual letter in turn, The first letter was a "w", the second an "e". Then there was a gap. An "a" followed, then a "p", an "o" and an "l".

Marvin paused for a rest.

After a few moments they resumed and let him see the "o", the "g", the "i", the "s" and the "e".

The next two words were "for" and "the". The last one was a long one, and Marvin needed another rest before he could tackle it.

It started with an "i", then "n" then a "c". Next came an "o" and an "n", followed by a "v", an "e", another "n" and an "i".

After a final pause, Marvin gathered his strength for the last stretch.

He read the "e", the "n", the "c" and at last the final "e", and staggered back into their arms.

"I think," he murmured at last, from deep within his corroding rattling thorax, "I feel good about it."

The lights went out in his eyes for absolutely the very last time ever.