The Three Ninjas of the 1992 box office hit travel to Japan to rescue their Grandfather Mori and return with a ceremonial dagger that has many interested parties after it - including group of spaced-out heavy metal rockers and Mori's longtime enemy. The dagger is the key to a secret cave of gold. Will the Ninjas be able to save the day? Will they find the cave of gold? And will they make it back in time to help their baseball team, the Dragons, beat their archrivals, the Mustangs?