Judging from the show’s popularity, this little Irken conquered Earth a long time ago. Welcome to WatchMojo.com, and today, we’re counting down our picks for the Top 10 Invader Zim Episodes. For this list, we're taking a look at some of the best episodes from the cult classic Nickelodeon series.

Won't somebody please think of the children?! For this list, we’ll be looking at controversial moments and plotlines from kids' shows that went too far considering the demographic they were targeting.

These unexpectedly dark episodes in kids cartoons still haunt us.

"SpongeBob" may never end, but these Nickelodeon series finales went out on top.

The darkest Nickelodeon episodes definitely weren’t meant for kids. For this list, we’ll be looking at the most twisted, scary, and thought-provoking episodes from Nickelodeon’s catalogue of shows.

Need to fill up on nightmare fuel? These cartoons have got you covered. Welcome to WatchMojo.com, and today we’ll be counting down our picks for the Top 10 Unexpectedly Dark Episodes in Kids’ Cartoons. For this list, we’ll be looking at episodes of kids’ cartoons with dark elements that were mostly uncharacteristic to the rest of the series. We’re also taking into consideration how messed up the plot of the episode was and will be excluding anime. Just be on the lookout for spoilers.

Ya no están con nosotros, pero no los hemos olvidado. Bienvenido a WatchMojo Español, hoy haremos el recuento de nuestras elecciones para los show animados más subestimados pero queridos que terminaron cancelados demasiado pronto

These kids shows went to some dark places. Welcome to MsMojo, and today we’re counting down our picks for the most mature and disturbing moments from TV shows aimed at younger audiences.

Gone but definitely not forgotten! Welcome to WatchMojo, and today we’re counting down our picks for the most underrated, but beloved animated shows that were canceled too soon.

Gasp! Welcome to WatchMojo, and today we’ll be looking at the most moving, shocking, or all-around unexpected moments from animated shows. Expect a few major spoilers ahead.

Nickelodeon made our childhoods so unhinged. For this list, we’ll be looking at the most surreal– and disturbing– moments from the big orange channel.

Some cartoons last for decades while others are cancelled for ridiculous reasons. For this list, we’ll be looking at animated series that were suddenly or tragically cancelled despite high ratings and glowing reviews.

The Nickelodeon villain songs give Disney a run for their money. For this list, we’ll be looking at the most sinister tunes sung by or about some of the best baddies we got to know on the kids’ network.

Cartoon mistakes are probably far more common than we think! For this list, we’ll be looking at some of the biggest mistakes with animation or continuity in TV shows that were discovered by the audience.

These Nickeldeon character rivalries are for the ages. For this list, we’ll be looking at relationships between characters from Nick shows who hated each other (or were at least adversarial toward each other).