The Planets of Doctor Who

This is the seventh planet in the Dundra system, known for its 11-hour days. It was once the home of the Aplans, all of whom are now considered extinct. These strange denizens were famous for building large and elaborate burial chambers, known as the Mazes of Death. As a favor to River Song, the Doctor and Amy visit this planet to help recover the fallen ship, Byzantium, that crashed somewhere in the Maze of Death.    

These two planets are both located in the Sirius system. They were once lush and covered with water. Over the years, however, they have become dry and desert-like. Androzani Minor consists of a huge network of underground tunnels, inhabited by creatures of all sorts, including giant bats and something called a Magma Monster.

(Apa-lapa-chi-ah) This planet is known for its beauty and splendor, named the number two destination for the discerning space traveler. It is covered with "soaring spires and silver colonnades." Unfortunately, when the Doctor and his companions arrive to see this planet, neither the soaring spires nor the silver colonnades are anywhere to be found. Instead, they come upon a planet of white corridors, seemingly abandoned. As they find out, Apalapucia was recently hit by a deadly plague known as ChenSeven. It is harmless to Humans, but deadly to two-hearted races such as the Timelords and Apalapucians.    

This is the home of the Argolins, who once upon a time went to war against their enemies. That war only lasted 20 minutes and left the entire planet irradiated. Faced with being unable to reproduce, the Argolins converted their entire planet into a luxury resort called the Leisure Hive in order to promote a peaceful existence.