This is a low-budget ripoff of "Rambo", and although the original "Rambo" was no great shakes, it's "Citizen Kane" compared to this stinker. Mark Gregory is such a terrible actor you feel embarrassed for him, but no one else is much better. Bo Svenson is the only American in the cast--even though it was shot in New Mexico--but at least they didn't dub his voice, like they did everyone else's (and, as is usual with these dubbed Italian movies, the dubbing is atrocious), so the best thing you can say about his performance is that you can recognize his voice. The action scenes aren't handled particularly well--a fight in a desert diner at the beginning of the picture is laughable and a bank robbery and chase scene toward the middle is so poorly coordinated it makes you wonder if anyone actually directed it, or if they just told the drivers, "OK, drive around town and bump into each other." There are plot holes you could build an eight-lane highway through and characters do things that make you shake your head in disbelief. For example, when Thunder is being chased and shot at in the desert by a helicopter, does he try to get to a place--behind boulders, among rocks, etc.--where the chopper can't see him or get to him? No, of course not--he stands out in the open, grabs a rope and tries to lasso it! What did he think he was going to do, pull it out of the sky? Anyway, the whole movie is filled with stupidities like this.
So, to recap, there's bad news and good news. The bad news is that "Thunder Warrior II" is a tenth-rate copy of a movie that wasn't particularly good to begin with, the script is laugh-inducing, the "acting" wouldn't pass muster in a porn film, the "action" scenes are shoddy and poorly done, the dubbing is not only terrible but annoying, and its "hero" is about as stiff, bland and colorless as they come. The good news is that, because a friend gave it to me, I didn't pay anything to see it. And that's pretty much the ONLY good thing about this picture.