We scifi geeks know what we like. And for our money, nothing is better than a tough chick holding a gun, or one busting out some gravity-defying aerobatics. Fortunately, science fiction is stocked with such heroines, whether they're hunting Aliens or Terminators. Put them together and you have the makings of the hottest girl-on-girl action this side of Andromeda. Can The Matrix's Trinity out-stunt Wanted's Fox? Does Sarah Connor shoot a meaner machine gun than Ripley? Vote now in AMC's tough chick tournament, where only the baddest (and hottest) survive.