Nickelodeon used to have great shows, but they cancel and take all the good shows off air. Like one of the reasons they cancelled Invader Zim was due to low ratings. Well, if you put a T.V. show on at 9:30 PM, not many people will be able to watch it. If Nick were to get some of its old T.V shows back on the air, they'd be a lot more sucessful.