The film concerns a group of extremely unscary baddies who decide that world domination can be best achieved by hijacking an amusement park. Two things prevent the villains from carrying out their evil plan. Firstly, the bad guys find themselves easily defeated at every turn by three children and Hulk Hogan. Secondly, those aforementioned bad guys are morons.
The three children are, of course, the 3 Ninjas. They defeat fully grown men in martial art combat at every turn. Particularly remarkable, since one of the kids appears to be about four years old. Of especial note is the second youngest as he sports a haircut that is so abysmally misguided it makes Billy Ray Cyrus's mullet look tasteful. It is a bowl-cut/pony-tail combo; two haircuts from hell all on one head - it is truly horrendous and should really not be seen by younger viewers.
An interesting aspect of the movie is that despite the fact that the fairground has been hijacked, no one seems to have informed the extras. They carry on enjoying the rides as if nothing has happened. As I said earlier, the bad guys are essentially idiots, so its just possible that they have not got their heads round the technicalities of hijacking. But, at the end of the day, it doesn't matter as the film is not exactly convincing in a general sense.
Do I recommend it? Not really but it is an ideal birthday present for a child you dislike.