Excalibur is a Marvel Comics superhero group, an off-shoot of the X-Men, usually based in the United Kingdom. Conceived by writer Chris Claremont and artist/co-writer Alan Davis, the original Excalibur first appeared in Excalibur Special Edition , also known as Excalibur: The Sword is Drawn. Originally, the series involved cross-dimensional travel that incorporated as many elements of Captain Britain’s mythos as it did the X-Men’s.