The Mystery Inc. gang takes a trip to Japan and finds themselves circling Asia and the Pacific in a treasure hunt, racing against the vengeful Black Samurai and his Ninja warriors to find the legendary Sword of Fate, an ancientblade … Casey Kasem, Frank Welker, Grey DeLisle, Mindy Cohn, Kelly Hu, Kevin Michael Richardson, Brian Cox Added on HBO 2022-06-07. Youtube Trailer