DeDanaan

Earth : Mostly Harmless. A small, blue-green world in one of the less fashionable sectors of the Milky Way Galaxy. Located in ZZ9 Plural Z Alpha. Although the primitive ape-descended denizens of this planet did not realize it, the Earth was designed by a supercomputer called Deep Thought, and was built by the Magratheans. Slartibartfast won an award for his fjords on the coast of Norway. The Earth was actually a computer so vast that organic life became part of it’s matrix. It was destroyed by the Vogons five minutes before the completion of its program in order to make way for a hyperspace bypass. Two humans survived; Arthur Dent, and Trillian. Two mice and some dolphins also escaped.