Okay, when I saw it in the video, I just couldn't believe it...after a first boring film, they made a second one, and after the very bad second one, they made an awful third one, and after the third one, here goes the forth one...Well, let's just say it is worse than the first and second ones, but better than the third. But it still sucks a lot. Some gratuitous nudity scenes, some cheap action sequences, and when I say SOME, it doesn't mean a lot...nothing happens during the whole movie, until the very predictable ending...One important point is the one liners...they are so awful it's terrible...the problem is that it is SOOOO evident that it's a mechanical and not natural sentence that comes out of Treat Williams' mouth...the acting isn't so bad, especially in William's case, but the way he says his one liners makes it a bad performance, and another factor to approve this fact is the stupid and pointless character that they offered him...and why is this called The Substitute??? The guy's just a mercenary, and he's in a military school, he's more a soldier than a teacher, he always beats up one student...with teachers like that, don't ask yourself why there are so many high school drop-outs...I mean, in the first and second films, the agent was a substitute, but in this one he isn't...There's an error in the script because they kill young boys in Panama, and one of them has the Werewolves' sign in his face (The Werewolves are a clan of nazi students at the Military College, and they are only 5 or 6 of them, so none of these folks could be in Panama...). This film has a very conventional script, with even less flavor, some below average acting, and boring directing. I guess we should wait for the fifth one, then the sixth one, and then the "Substitute Gift Box"...bad film. 4/10