There is one all-important reason you should view this film: The Ninja Water Spider Attack Team! One of the most insane ideas ever to be recorded on celluloid: ninjas hopping about a lake on top of giant, rubber spiders! The other ninja teams're pretty good too, especially the dudes who dig super-fast under the ground. Also worth looking out for is the sequence where the fighters do their formation-marching in front of their leader: one pattern they assume is a swastika-shape, like something from "Springtime for Hitler"! Oh yeah, one more thing to watch out for: the totally naked girl fighter who likes to do high kicks! The original film/series that this footage comes from supposedly runs for hours and hours! Some more of this footage can be seen in Shaolin Dolemite.
Review of Ninja the Final Duel
