The titular "Osa" ("female bear" in Spanish) is (Kelly Lynch), a brave young woman with a superactive persona and stiff training in target practice since her days as a tot. Set in a thirsty future dystopia when all the water has been contaminated, a Mr. Hammond -- one evil capitalist -- has cornered the market on potable water and is selling it for $200 a gallon. His chief thug is Mr. Big (Daniel Grimm) who terrorizes one and all, until several murders into the storyline he is finally in a confrontation with Osa. That last bloodletting is staged as an elaborate game, but for some reason the baddies are under the fatal assumption that Osa will play by the rules. As usual, motivation and character development are the first casualties in the build-up of violent scenes leading to the culminating gore.