#12: Invader Zim
Invader Zim is a 2001 sci-fi animation that aired on Nickelodeon in 2001. It was created by cartoonist Jhonen Vasquez and follows Zim, an extraterrestrial who belongs to a species that wants to take over the universe.
The show is characterized by dark humor and sometimes features content that can be scary, violent, or simply too weird for kids to understand or enjoy.