Liopolis is a watery planet in the Pliosaur Nurseries that is ruled by the liopleurodon. It is the home planet of Don Leo and is the original home of whisperfish, their main food source on the planet. While the liopleurodon have not been responsible for attacks on the Vegetarian Sector like the T. rexes and raptors, their territorial natures and carnivorous habits cause them to be given a wide berth by the other inhabitants of Sea Reptile Space. The official newspaper of Liopolis is the Liopleurodon Times, and it is defended by the Liopleurodon Space Fleet.