"teenage mutant ninja turtles" (1987) deals with it twice. in "ninja sword of nowhere", an alien spacecraft left a fragment of an alien metal, used to travel between dimensions in a mere microsecond, on earth thousands of years ago, before a craftsman found the alien metal, forging a japanese sword. this creates a legend of a sword which allows its owner to show up and disappear whenever he or she wishes. even "sword of yurikawa" has a plot with an old japanese sword.