10 Best Fictional Planets In Sci-Fi Movies

Perhaps the most impressive of the late great Douglas Adams' many brainchildren, Magrathea is an ancient planet in the Horsehead Nebula, home to the Magratheans, hyperspatial engineers who specialise in creating luxury, custom-built planets, and who were responsible for the creation of the planet-size computer we know as Earth.

Seen in 2005's barmy and achingly British Hitchhiker's Guide to the Galaxy, Magrathea is 'closed' to visitors and appears, on the surface, to have been deserted in the wake of its over-successful planet building business; their wealth eclipsed that of the rest of the galaxy, who bankrupt themselves paying the Magratheans to build their dream planets.

However, the snowy wastelands that make up Magrathea's surface hide its rich and illustrious underbelly.

One of the only Magratheans not to go into hibernation, Slartibartfast, continued operations within a pocket dimension inside Magrathea, building the planets it is so famous for making - including the second Earth. Here, there are scaffolds and workshops and entire universes worth of planets in production, with unlimited space in which to work, while a very surprised looking whale sits on the planet's surface somewhere adjacent and above.