The Hitchhiker's Guide to the Galaxy has this to say on the subject of Eta Carinae Delta:

"Avoid this planet! Eta Carinae Delta is the third least hitchhiker-friendly place in the Milky Way Galaxy. Staying there for any period of time requires you to obtain (usually by purchasing) a license. Also, since the natives are all made of metal, they aren't much for fun, festivities, conversations, eating, breathing, helping out, or doing anything organic whatsoever.

Eta Carinae Delta also has no pubs."

The book then goes on to explain the best ways to avoid Eta Carinae Delta, ways to rehabilitate after being there, and what dimensions it doesn't exist in.

For some reason, the next entry in The Hitchhiker's Guide to the Galaxy was somehow deleted leaving many confused about the purpose of etymologists.

Arthur Dent had not looked up Eta Carinae Delta before going there, so it wasn't until after he had read this, and had it explained to him by Fenchurch four times, what a dull and uninteresting place the planet was.

Of course, he found it out on his own anyway.

It had been a week since Arthur had started living on Eta Carinae Delta with Fenchurch. They shared an apartment that looked like a gigantic weeping willow. They're room was about midway up near a hollow. Arthur hated it because a tree didn't provide as much privacy as a stone building, but Fenchurch liked it for the same reason. Today, they were going to attempt to leave the planet-again.

"Are you ready now?" Arthur asked Fenchurch for the sixth time.

"Almost," she replied, "I just need to figure out the rest of the plan."

Arthur sighed. He sat down and picked up Fenchurch's notebook. Inside it were all the plans they had used to try to escape, but failed somehow. Eta Carinae Delta had strict rules about travel. Since Arthur had arrived on Eta Carinae Delta improbably, according to the rules, he had to leave improbably as well.

Arthur disliked this rule because he really wanted to leave Eta Carinae Delta, partially because it was boring, but mainly because there was no tea on this planet.

Fenchurch finally came down holding a large sheet of paper.

"Okay, I'm ready," she said.

"Finally," Arthur muttered, and with that, they exited their branch, walked down a spiral staircase, exited the complex, and immediately had a large vat of chai tea dumped on their heads.

The next part was very odd.

Numbers swirled all around them, monkeys did strange dances with turtles, a chocolate bar began to eat itself while a pistachio applauded, and the rest of the planet seemed to become mad.

"What's happening?" Fenchurch inquired worriedly.

"Er," Arthur replied with as much intelligence as he could muster.

If either of them had said anything else, it was lost in the maelstrom of confusion that ensued. They felt as if their bodies were ripped apart and reassembled. As they staggered about in a room that had just materialized around them, Arthur and Fenchurch could just make out a voice that said, "2 to the 856th power to one against and falling."

The room turned a strange shade of pink, but Arthur didn't care, he knew he had heard that voice somewhere before. It was cheery and polite and sounded like the voice of someone who liked math problems and had never eaten a peanut butter and jelly sandwich in his life.

"Two the 477th power to one against and falling," it said again, pausing only to add, "Two to the 99th power and falling. Glad you could be with us, guys!"

"Arthur," Fenchurch whispered, as any other sound seemed to blast out at maximum level, "What's going on here?"

"I believe," Arthur whispered in reply, "That we have become entangled in that infernal Improbammmmph!"

Arthur's mouth had become entangled by the Great Cthulhu, so he could not use it at the moment.

"Two to the 4th power to one against and falling." The voice said. The Great Cthulhu disappeared.

"What I'm trying to say," Arthur began again as a road sign reading, "Now entering Ohio" flew over his head, "Is that we seem to be entangled in that infernal Improbability Field."

"What's an Improbability Field?" Fenchurch asked as a she pointed to a cow the best way to get to Luxembourg.

"Two to one against." The voice said again.

"It's complicated." Arthur said.

"One to one against," the voice said, "We have reached normality, I repeat, we have reached normality. Hi there, Arthur! Did you have a nice trip? Who's your friend? Should I help you reach the bridge?"

"No, that won't be necessary," Arthur began, "Come on Fenchurch, it looks like we're back on the Heart of Gold."

"What's the Heart of Gold?"

"It's a spaceship Zaphod stole. It's annoying."

"Who's Zaphod?"

"He's this guy with two heads and three arms."

"Oh, so he's from Belgium?"

"No, he's from space. He's a friend of Ford's."

"Ford Prefect? The man who got us onto that spaceship with the giant robot?"

"Yes, that Ford Prefect."

"Thank you for making a simple door very happy." Said the door they had just walked through.

"Why did you say this ship was annoying?"

"It has this strange device on it that makes anything that couldn't happen happen. I'm guessing that's how we got picked up by it."

"I see. So, where's the bridge?"

"It's right up here."

"I'm so happy you decided to walk through me!" Cried out another door as they walked through it and onto the bridge to be confronted with a man with two heads smiling at them.

"Hey, Monkeyman!" Zaphod called out.

"Hello Zaphod. Fenchurch, this is Zaphod, Zaphod, this is Fenchurch."

"Hello, Zaphod." Fenchurch said as she stuck out her hand. Zaphod shook it with the hand that wasn't holding a cigar and the hand that wasn't holding a Pan Galactic Gargle Blaster.

"Hi." Zaphod said, then he took another swig at his drink.

"So, er," Arthur began, "Where is everyone?"

Zaphod shrugged, "You should know. Don't you remember?"

"Oh, yes, I forgot. I hope they're okay."

"Hey, the last time I checked, Ford and Trillian were with you. What happened, did you ditch them for your friend here?"

Arthur glared at Zaphod for a moment before saying, "No. The planet we were on got blown up. Somehow, I ended up on the planet Fenchurch is on, and I can only hope that Ford, Trillian, and Random are okay."

"Zappo, the planet you were on was blown up? Wowee, I'm glad I missed that party!" Zaphod laughed before adding, "Say, who's Random?"

"It's er, complicated. She's my, er, daughter, but-"

"YOUR WHAT!" Fenchurch screamed at him.

"But she's not my daughter," Arthur continued patiently, "Trillian decided to have an artificial insemination, and I was the only human match they could find."

There was a pause in the room. Suddenly Zaphod said, "I would think so."

Fenchurch, after recovering from the shock, was looking about the ship. She noticed a large gold button.

"Hey," she said, "What does this do?"

"NO! Don't-" Arthur and Zaphod said in unison, but Fenchurch had already pressed the button.

To the nearby planet of Jarris, there seemed to be a supernova in the sky, which they found odd because there weren't any stars close enough for them to witness a supernova during they, even though they only had three seconds to worry about it before the entire planet was incinerated in the blast.