Apparently in example sentence
The reason for this is simple, apparently Godfrey and Joespeh Lai found reels of unreleased Hong Kong movies so to make a quick bit if money they shot some Ninja scenes and edited it in to other films then re-dubbed the unreleased movie they was using to make it like it was connected to their Ninja movie, it does make sense since why does the films always have a Ninja plot and a non Ninja plot, wouldn't it just have one plot like American Ninja.