The Ultimate Hitchhiker's Guide

I've taken this description from the cover of the book. Here it is.

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The Hitchhiker's Guide to the Galaxy

Arthur Dent, mild-mannered, out-to-lunch kind of guy, is plucked from Earth just before it is demolished to make way for a hyperspace bypass. Towel in hand, he begins his journey through space and time with his rescuer Ford Prefect, a travelling researcher for the Guide.

The Restaurant at the end of the universe

The floor show is Doomsday while Arthur and Ford dine with Zaphod Beeblebrox, well-appendaged, ex-head honcho of the Universe., and Trillian, his human girlfriend. The four friends begin their quest for answers to some of the most confounding questions challening mankind: When will they finish eating? What is the question to the ultimate answer?

Life, the Universe and Everything

Everything important and then some is examined in this third book, when Arthur Dent and his companions find they must avert Armageddon and save the universe for life as we know it (or think we know it!).

So Long, and thanks for all the Fish

Galaxy-weary space traveler Arthur Dent returns to Earth with his new voidoid gang to discover that it has been mysteriously reinstated. But more pertinent questions remain: Why did all the dolphins disappear? What is God's final message to His creation? What really happened the day Earth was demolished?

Young Zapohd plays it safe

Two two-headed hero travels to the depths of the ocean floor to investigate the mysterious destruction of the ship that "could one hundred percent positively never crash". With the annoying assistance of the Safety and Civil Reassurance Administration, Zaphod learns some disturbing secrets...

Mostly Harmless

Once again, Arthur Dent tries to retrun to Earth, but instead settles for an honorary position as master sandwich maker. Meanwhile, the Guide seems to be changing in much-too-mysterious ways, which keeps Ford Prefect on the run -- running into Arthur Dent whose daughter has just hi-jacked Ford's spaceship.

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