Shredder breaks into the Ninja Hall of Fame and steals the diary of the infamous Brothers Kojima. He leaves his fingerprints all over the place though, and one Lt. Saki finds them: Shredder's brother!  Burdened with his evil brother's past and present sins, Lt. Saki vows to bring in his sibling and travels to America to track him down. He meets up with the Turtles by accident at the Nuclear Fusion Reactor, where they are safeguarding a new super-magnet, which they suspect might be Shredder's next target.