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Dragons were reptilian creatures from Earth myths and legends. They resembled giant lizards, often with wings and/or the ability to breathe fire. In 705 there were dragons in Krakow. (PROSE: Only Human) According to some sources, much like the ancient Egyptian gods, dragons appeared to be also be a native species to Earth, sometimes serving as omnipotent beings. (COMIC: Vortex Butterflies, et. al)
It was commonly believed that the classic markings of "Here There Be Dragons" on maps were metaphors and that dragons weren't real. However, when someone said as much in their vicinity, the Gestalt stated that this was simply "what the dragons want you to think". (PROSE: Ring Theory)
A dragon was the guardian of the Vault of Plenty on Gemino. It killed anyone who failed to provide the correct answer to the puzzles required to gain access to the Vault. (COMIC: The Secret of Gemino)
Dragons were found on the planet Avalon, having been brought to life by the system of nanobots which had been devised by the Cephlie. In the 22nd century, human colonists arrived on the planet and the nanobots, which acted on mental impulses, brought to life the fantasies of those colonists, including that of dragons. One such dragon chased down the First Doctor, Susan, Barbara and Ian, before it was slain by Sir Bron of Westhold. (PROSE: The Sorcerer's Apprentice)
The Twelfth Doctor once claimed, when being attacked by a race of dragon-like beasts who were indigenous to a planet, that dragons were fictional. Lord Mortigan explained that the dragons had to have been genetically modified "a little" by the human colonists. They were inhibited and enslaved by the colonists' inhibitor chip, which the Dragon Lord had freed them from. The dragons subsequently killed the royal family as well as the Dragon Lord in the Red Castle. The dragons were left to roam the planet freely, after the Doctor contacted group of rescue ships to pick up the surviving humans. (COMIC: The Dragon Lord)
A poster for Shrek was pinned to the wall of the children's ward at St Helen's Hospital, in early 21st century Cardiff. It featured Dragon, a fictional character who appeared to be a dragon. (TV: Dead Man Walking)
Dragons existed in the dreamrealm inhabited by Avalon. The Fair Folk used them to harass infantry and prevent UNIT's domination of the air through the use of jet fighters. The Eighth Doctor rode one deep into Fair Folk occupied territory in order to attempt to forge a ceasefire. (PROSE: The Shadows of Avalon)