Purists were upset when Steve Purcell's darkly antic underground comic strip was turned into a short-lived kids' TV show a decade ago. We, on the other hand, are grateful that the NYC-based private-detective series is getting a three-DVD issuing, giving kids a chance to soak up Purcell's wordy impudence, along with his crazy imagination. Yes, the heroes — a noirish canine and his bunny sidekick — sometimes use extraordinary firepower. Look past it to the genius girl called the Geek, who provides tech support.