Watched the Mystery Science Theater 3000 version.
There are some movies that are so bad, even this show can't save them. This is one of them. I watched the whole thing and I couldn't tell you what it was about. It's hard to enjoy it even on a so-bad-it's-good level.
Lee Van Cleef is technically in this movie, but he's replaced by a stunt actor in a ninja mask in every scene that matters, which is somewhat amusing.
Highlights include a police car that explodes for no reason, the Master ripping a car's steering wheel out of its socket with almost no effort, and one kind of decent sword fight.
Lowlight was, unfortunately, the horrible beatboxing from Joel and the bots, which was worse and harder to sit through than the movie itself was. Sorry guys, but being self-aware of how bad you are doesn't excuse this bit.