For questions about the legend King Arthur and other characters from the stories in which he features. Only use when asking about Arthurian legend in science fictional and/or fantastical works; if asking about the legend itself see mythology.stackexchange.com
The legend of King Arthur is a collection of stories from the British Isles, spanning several centuries and attributable to many cultures. These stories have been treated in literature, television, and film, which is what this tag deals with.
If your question is about the Arthurian legends itself, not how they are portrayed in a science fiction or fantasy fiction work, you may ask it on the Mythology Stack Exchange website instead of here.