Batman: Soul of the Dragon

It is the 1970s and Batman teams with some unlikely people. The world's greatest detective discovers that there is a common link between him, Richard Dragon, Lady Shiva, and Bronze Tiger. They each were trained by the same master of the martial arts, who just so happens to have been missing for many years under very mysterious circumstances. They track down the mystery to the origins of a mysterious ancient relic that may just claim all of their lives