Kickboxer 3 isn't worth the money, or the rental. Dennis Chan is a comic sidekick and teacher to David Slone who plays a chilsed jawed kickboxer who seems to resemble that bad karate kid from Karate Kid III.
Anyway, the film has David going to Brazil for a kickboxing fight but gets drawn into the seedy world of underage prositutes or something and gets drawn into the local riff-raff.
Even though he's only a kickboxer and only there to kick the ass of the Ivan Drago type kickboxer he goes out on a mission to take out the local bad guy, who isn't even Portuegese or Brazilian, but American.
The fight sequences are okay - but that is it, nothing compared to other martial art movies you can get for the same price.
Avoid it. 1/10