 In the years following the great Los Angeles earthquake, two orphan are raised and trained in martial arts by Satori, who also happens to be the caretaker of one half of a magic amulet. When the evil Koga Shuko finds the other half, he immediately goes on the attack to take Satori s piece and claim the power contained within the amulet. Only Satori s two boys, Billy and Jimmy, can stop Koga from reaching his goal.