Like the horror-comedy genre it salutes, this post-Buffy vehicle is almost better when it’s bad than when it’s good. Based on the comic book published by local outfit Devil’s Due, this New Millennium Theatre Company production follows the adventures of slasher-hunting vigilantes Cassie Hack and her sidekick Vlad. Adapter-director Chad Wise tries to replicate onstage the quick crosscutting of the graphic novel, which proves more trouble than it’s worth. That said, the show is a high-energy riot, with exuberant stage combat, a savvy sound track featuring Rob Zombie and Jack Dangers, and enough spraying blood to warrant a tarped-over seating section. And Stefani Bishop as ass-kicking, wisecracking hottie Cassie looks and acts the suicide-girl part to a T. Through 10/29: Fri-Sat 10:30 PM. National Pastime Theater, 4139 N. Broadway, 773-989-4515. $10-$15.