As a fan of Grade Z movies myself I'll say this as a word of kindly advice: don't watch this movie as it is!!! You've been warned! This movie has tons of continuity problems and the special effects are unbelievably horrible!!!
Cave Dwellers or The Blade Master (or whatever you like to call it) is set in the Middle Ages, right? Ator and his friends set out to fight some evildoer who sacrifices young girls to an anaconda, and along the way they fight cavemen, invisible swordsmen, an anaconda puppet, and get this, they have to protect the earth from a bomb called a "Geometric Neucleus" that posesses nuclear power!
MST3K had every right to make fun of the hidiously terrible movie. Since when was there hang gliders, hand grenades, and nuclear power back in the Middle Ages?! Other bloopers that were mentioned were the hang gliding scene, and as anyone can see, Ator was flying over a modern city, and a caveman wearing sunglasses? And who can forget the infamous 'tire tracks' in the background at the end of the movie? Heck, even Joel and the 'bots were complaining about this literally bad movie!
If you're a fan of bad movies and you want to check this one out, it's only worth watching on MST3K! Another thing I can't believe is that these Ator flicks even had a prequel and some sequels! You would probably feel sorry for Miles O'Keefe for even participating in such stupidity of this type of entertainment. But the movie is funny, and the MST3K version is even funnier.