2005 - 2005 | 3 seasons | 61 episodes

Avatar: The Last Airbender is an animated action-adventure fantasy series that ran on Nickelodeon from 2005 to 2008. Avatar's world is inspired by Asian cultures, and in this world, certain people have telekinetic powers allowing them to control one of four classical elements - water, fire, earth, and air. Then there's the Avatar - the chosen one who can control all of the four and whose mission is to keep a peaceful balance among the nations. This Avatar is Aang, and together with his friends, they set out on extraordinary adventures to restore said balance. The series is ingenious with the excitement it creates, the nice moral messages it gives, and, of course, the most loveable characters in the most unexpected situations. Some critics even named Avatar one of the best animated series ever, and we couldn't agree more!

1999 - 2002 | 2 seasons | 52 episodes

Courage The Cowardly Dog, an animated horror/comedy series, follows Courage - a kindhearted yet easily scared orphaned dog whose parents were sent into outer space by a crazed veterinarian. Now Courage lives with an elderly couple, Muriel and Eustace, in the middle of Nowhere. Somehow it seems that the trio always gets into some bizarre, nightmarish misadventures with various entities, monsters, and occurrences haunting everything they do. Courage The Cowardly Dog is truly one-of-a-kind series filled with surreal humor, an eerie atmosphere, and always original happenings.

2001 - 2006 | 2 seasons | 28 episodes

Invader Zim follows one too-smart-for-his-own-good alien Earth invader Zim who came from the planet IRK. Pretending to be a child and with the help of his robot GIR, Zim's mission to take over the Earth seems very plausible up until the point a wrench named Dib interferes with his evil plans. Invader Zim has to be one of the wittiest shows ever created, and if you'd like a series that'll deliver one smart joke after another, this series might be your best choice.

2001 - 2017 | 5 seasons | 62 episodes
 

Samurai Jack follows the adventures of the titular Jack - a Japanese samurai prince who wields a mystic katana capable of cutting through anything. Jack sets out on a quest to hunt Aku, a shapeshifting demon who's terrorizing his kingdom. But, of course, it isn't all that simple, and once Jack is about to deal a final blow to the demon, he sends the samurai into a dystopian future where the land is ruled by another demon. At this point, Jack's mission gets even more complicated, but it's all the more fun for the viewers!

2001 - 2004 | 2 seasons | 52 episodes

Justice League is the legendary formation of the seven most famous superheroes of probably all time - Superman, Batman, Wonder Woman, Green Lantern, The Flash, Hawkgirl, and Martian Manhunter. And with these legends standing against the forces of evil, destruction, and chaos, you can definitely sleep in peace tonight. Even though the seven are totally fictional and act as animated characters. Nevertheless, Justice League is a whole lotta fun without dumbing down the original comics, something we all love!

1999 | 13 seasons | 271 episodes

So, it's a sponge living under the sea in a pineapple, hanging out with a starfish, a crab, a pet snail, and a squirrel. And that's just to name a few odd characters from SpongeBob SquarePants, an animated series that became a real phenomenon throughout the years of its run. Created by the legendary animator and marine science educator Stephen Hillenburg, this series is full of imagination and the most unbelievable adventures experienced by the weirdest characters. It was, and still is, something completely different compared to all the rest of the animated series, mostly because of its originality that stems from an unexpected setting, ingenious characters, and the beautiful message underneath it all.

2003 - 2006 | 5 seasons | 66 episodes

Teen Titans, an animated superhero series, follows the lives and adventures of the five main members of the eponymous team. Each one of them has a set of very specific abilities, from being able to communicate with animals to having psionic abilities. The team all live together in the Titans Tower and protect their neighboring city from various threats and criminals, all the while trying to live their adolescent lives as normal teens. Teen Titans soon became one of the most acclaimed Cartoon Network series, praised for its character development, humor, and serious themes. In fact, it pretty soon became so famous that multiple spin-offs, video games, music albums, and collectibles were released.

2008 - 2009 | 2 seasons | 26 episodes

The Spectacular Spider-Man focuses, you guessed it, on the story of Peter Parker. However, in this animated series, Peter is a sixteen-year-old kid whose spider powers just came to play, and together with him, we get to learn the origins of this spectacular story. So expect no less than fancy adventures and breath-taking encounters with Spider-Man's various nemeses.

1999 - 2002 | 3 seasons | 29 episodes

Redwall follows the story of a young mouse who, after losing his family to a rat warlord, is adopted by an abbey. And although the novice mouse respects and understands the peaceful philosophies of the order, he still dreams of becoming a great warrior and avenging his family. Fate leads him to this path as the rat warlord attacks the peaceful abbey and launches a full-scale war. Redwall is truly an inspiring series glorifying the underdog, stressing the value of love, loyalty, and courage every step of the way.

2000 - 2004 | 4 seasons | 77 episodes

The Weekenders follows four best friends - Tino, Tish, Carver, and Lor - as they try to make the most of the very short time they have off school each weekend. Usually, their plans of making the most of their time go hilariously awry, and each adventure turns into a happy little misadventure. And although the foursome of friends is from entirely different worlds, considering their hobbies and dislikes, they manage to form an unbreakable bond. The Weekenders is truly one of those feel-good series that'll entertain you and lift up your mood.