A mysterious ninja is robbing Wayne Enterprises subsidiaries, and Batman discovers that the ninja is actually his equal in combat. A grudge against Bruce Wayne and skills to match him can only mean one person: Kyodai Ken, an old rival of Wayne's teacher from his days in Japan, and who was thrown out of the dojo after attempting to rob it, only to be stopped by Wayne. Ken, it turns out, wants revenge.

Selina Kyle is kidnapped by the villainous genetic engineer Dr. Emile Dorian and becomes his latest experiment to provide his man-cat hybrid named Tygrus with a mate. Batman learns of this and comes to the island to rescue Selina. He is captured and forced into a deadly game of cat-and-flying mouse as Tygrus hunts Batman through the island's jungles.