The Challenge is a classy effort directed by John Frankenheimer. Scott Glenn stars as an American boxer who finds himself in the middle of a Japanese blood feud. Toshiro Mifune and Atsuo Nakamura plays the last surviving brothers of an ancient samurai family, embroiled in a battle of the possession of the family swords. Once involved in this contretemps, Glenn must also contend with the minions of the Yakuza, a Japanese Mafia-style organization. Sword of the Ninja was co-written by John Sayles, better known as the writer/director of such films as Brother From Another Planet and Eight Men Out.