Aaahh!!! Real Monsters
Years: 1994 - 1997
This often overlooked Klasky Csupo show follows the adventures of Ickis, Oblina and Krumm at a high school for monsters, located under the city dump. Under the tutelage of The Gromble, they learn how to scare humans, including being given assignments that take them to the surface world. An offbeat, fun show.
Years: 2001 - 2006
From the creator of Johnny the Homicidal Maniac, Jhonen Vasquez, came this slice of animated anarchy. Zim is an alien from the planet Irk. He thinks he's a great world-conqueror, but he's fairly incompetent. Frustrated by his constant screw-ups, the Irken leaders, The Almighty Tallest, send him on an assignment to a nothing planet as far away from Irk as possible - Earth. Along with his dim-witted robot side-kick Gir (Possibly the show's greatest character), Zim sets himself up on Earth as a regular schoolboy, all the time plotting to destroy the planet and doing battle with Dib, an unpopular boy who suspects Zim's secret. A work of genius.
Ren & Stimpy
Years: 1991 - 1996
The adventures of a psychotic chihuahua and a dimwitted cat may not seem like the most logical of pairings, but it was a brilliant one. The show was so controversial that original creator John Kricfalusi was fired early into the run. The show got lighter, but no less surreal and it was every bit as funny. One of the most influential cartoons of all time, and one of the funniest.