Twenty years ago evil danish film star Frans Rayner battled Dan McNinja, Dr McNinja's father, for leadership of the American Ninja Guild and Rayner was near to winning until a younger Doc found his weak spot and helped his father win. In the present day Rayner is back with a bunch if mooks high on a drug that gives them ninja powers and he planning to kill not only Dan, but the doc himself. Now the Doctor is forced to make a choice, whether he will stay with his mentor Benjamin Franklin and discover a cure for death or help his father beat Rayner. It is also revealed in this story that Rayner was responsible for the 1980's ninja holocaust.
— Description from Comic Vine community (comicvine.gamespot.com).
