sentences: "According to director Steve Ressel, Nickelodeon held a test screening for the episode "Dark Harvest" during which one kid ran out of the room crying before the episode was over and others were visibly shaken and clearly terrified at what they saw.In 2006, "IGN" ranked "Invader Zim" at number 22 on their list of the Top 25 Primetime Animated Series of All Time and in 2009, "IGN" ranked "Invader Zim" at number 57 on their list of the Top 100 Animated Series.