Double Dragon

In the years following the great Los Angeles earthquake, two orphans 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.