At the risk of telling you how to parent, ID, maybe you should watch that
series more carefully. It is not really for kids in my opinion. The characters
are alternately negative, cynical, mean, and just plain idiotic. The themes
are also dark and often end on a negative note. If it has any redeeming
qualities for children, they are quite elusive.

No, not all kids stuff has to be Telletubies, but I wish people would realize
that cartoons do not equal kid's entertainment. Same with comic books these
days.

And just for the record, yes I think Invader Zim is brilliant, but I was always
shocked that it got on Nickelodeon and stayed as long as it did.